The footprints are too small to come from the Lizard Man's flippers.

The underwater elevator is in a clear tube which for some reason turns blue below the moving platform.

Arctic Splashdown

The missile reappears under the fighter jet's wing after it's already been fired.

Twice the sub shows a jet on it's viewscreen, a jet that does not appear in this episode. AIs the crew watching TV?

Why can't the Snow Goose go around the walrus? Can't it turn?

The latch on the back door of the Snow Goose is unfastened. It also looks different in the close-ups.

While the ship is anchored at night seems like a good time to try attacking with one of those torpedoes.

The assassin leaves his rubber raft right next to the ship, but when he leaves, the raft is suddenly off behind an iceberg.

The shovel hanging behind Dr. Quest's head changes shape.

The Curse of Anubis

This is the only episode to have a supernatural solution.

The doors to the temple open by themselves.

The boys hide behind a dune a few feet from where Race is lying on the sand, but it's not visible from the window.

On the plane, there is someone in the seat in front of Hadji who looks an awful lot like Jonny from the back.

The leash vanishes from the luggage handle, and from Bandit's collar.

Bandit's mask turns white for a moment.

How do the venetian blinds open so the mummy can peek in?

The mummy is right outside of Kareem's window but never goes in after him.

Jonny's collar is temporarily peach-colored.

For the first and only time, we see Hadji without his turban. Normally, he sleeps and even swims in it.

The two henchmen swap voices.

When Hadji drapes a blanket over the driver's face, neither he nor his friend even try to remove it.

How do the boys find the ruins where Race and Dr. Quest are imprisoned? Ahmed Kareem certainly didn't tell them the location.

There seem to be no tracks in the tunnel when the kids ride the motor scooter through.

The mummy has a loose bandage on his foot, but not always on the same foot.

Pursuit of the Po-Ho

There are several ventriloquists in this episode: Bandit barks and growls without moving his mouth; Race asks about "Ronio," but Dr. Quest moves his lips.

Emil translates for Dr. Quest several times, although Quest already proved he speaks the Po-Ho language.

The Po-Ho begin to yell, "Aquezio" when all they see is a reed moving through the water.

Race's splash makes no sound.

Dreena returns to her camp, promising to watch the boys, but they are already gone, sneaking off to help Race. Although we never see what happens, you can imagine how frantic she must be.

If the Po-Ho are planning to kill their prisoners that night, why do they bother going to sleep?

What is Hadji doing with that rope? He lets it out for Race, but when we see Race later, the rope he's carrying is not connected to the boat.

Hadji's jacket briefly becomes tan, to match his pants.

Riddle of the Gold

Hadji's hands turn white.

Those elephants look like the African variety to me.

Why doesn't Race even try to shoot the tiger when it attacks Ali? Maybe because, for some strange reason, he doesn't even have his gun any more.

Interestingly, Dr. Zin doesn't have a mustache in this episode.

Treasure of the Temple

Everybody paddles pretty much on the same side of the canoe, which is not the most efficient way to get where you want to go.

Race aims for the stalactites because he's low on ammunition. Yet, it takes him plenty of wasted shots before he can hit the cave formations correctly to damage the enemy canoe.

And besides, why shoot the stalactites at all? Although it may be tough to hit a moving target, such as a canoe, it must be easier than timing the stalactites to hit the boat.

Calcutta Adventure

Jonny and Race say they'd better hurry or they'll miss the demonstration. If they mean the destruction of the model city, they've already missed it.

Dr. Quest is wearing a tie which vanishes and reappears.

Everyone is sitting together in the restaurant when suddenly, Jonny and Hadji leave to pursue the would-be assassain. Didn't Dr. Quest and Race see the boys leave? Were they off paying the check?

Hadji loses his shoes.

Quest's hair turns temporarily white.

Race switches from mittens to gloves and back again.

Dr. Quest loses his goggles in the avalanche, which is understandable. But he regains them at the bottom of the mountain.

The bottom of the office chair changes color.

The chief villain uses ski poles in the far shot but has none in the close-up.

If they ski downhill from the helicopter to the lab, how do they then ski downhill from the lab back to the helicopter?

Race and Dr. Quest can't hit the men shooting at them, but they can hit those skinny cables holding the overhead vats.

Race tells Quest twice to go on ahead. Apparently he never goes, because Race is always in the lead whenever we see them running.

The waistband on Race's coat is colored incorrectly.

The Robot Spy

The base tracks the UFO on radar and sends planes out to intercept it. When the planes arrive, the UFO hides underwater, resurfacing once the planes have passed. As it continues on its way, why doesn't it reappear on the base's radar?

Dr. Quest's communicator looks exactly like UNIS, the computer from Mystery of the Lizard Men.

A sentry sees a red glow which alerts him to the location of the downed ship, but the craft is never glowing when we see it.

Race talks in Dr. Quest's voice.

Dr. Zin tells the robot spy to press the top button on its left. Actually, the button it chooses is nearly in the middle of the panel.

Too bad Zin didn't have the data gathered by the robot spy transmitted to his lair over the airways, the same way his voice is transmitted to taunt Dr. Quest.

Race and Dr. Quest chase the robot out of the lab but somehow end up ahead of it, waiting with the tanks.

Double Danger

The beach umbrella casts a shadow, but not Race or the boys.

"The use of this pill could be abused," says Dr. Quest. A brilliant scientist should have a better command of the English language.

Zin stands in front of the movie screen, the film projecting onto his face, yet he doesn't throw a shadow on the screen.

A cart of food is wheeled in for Korchek to practice with, but the food vanishes and is replaced with pen and paper.

Is Suthep simply a terrible driver, or was he trying to kill Race and the boys? Did he put the king cobra in the clearing, since we're told it would never have come on its own? Is Korchek responsible, since he wasn't surprised to see it? Why? Is this all part of the plan somehow?

Race doesn't have his camera when he climbs down the rope.

Nobody notices that Korchek is wearing a shirt different from Race's, and that he doesn't have a watch.

Although the boys are shown closing their shutters as per Dr. Quest's instructions, the shutters in the background in the boys' hut remain open.

Jonny and Hadji develop the photo Race took of Korchek, but somehow Tabak is in the photo, too, although he was standing behind Race at the time.

Our heroes exit the Buddha, but couldn't hope to escape the explosion without the fortuitous arrival of Jade's pilot. Which means that Tabak could never have escaped in time. Dr. Zin must've intended the poor dupe to die all along.

Race loses his watch for a moment.

Hadji is supposed to drop onto the lead elephant, but there are at least two elephants slightly ahead of his mount.

Shadow of the Condor

Although praised for his accuracy, the Baron must completely miss one shot at the fake condor, since there are only two bullet holes in the target.

For the first and only time in the series, Race calls his boss "Benton."

When the Baron's plane crashes, the tail is intact, although Race earlier cut the end off.

When we see the condor outside the plane at the very end of the episode, a white thing appears on the mountainside. What is it?

Skull and Double Crossbones

The cardiograph on Race's machine doesn't move at all in the far shots.

Knowing Hadji can fit through the porthole, why don't the villains watch to make sure he doesn't try it again? Then they'd see Jonny tossing the scuba gear to Bandit and sending him for help.

I can't spot the Chief and his gang in the far shots of the fleeing boat, even though they are standing out in the open shooting.

The Dreadful Doll

Jonny is wearing a watch in some shots.

Jonny's eyes disappear from his head, but only for an instant.

Quest comments that no one knows where he is, yet somehow Philipe Lor knows and sends for him.

How does Korbay leave the Suga doll on Quest's pillow? The doctor was still in bed when Korbay ran from the room and dived overboard.

When Dr. Quest asks, "Can you hear me?" Denise answers, "Oui, Papa." Obviously, she doesn't hear him all that well if she can't distinguish his voice from her father's.

The secret sub base is crawling with workers when Race arrives, but when the boys show up, it's deserted. Coffee break time?

Race presses button "1" each time he fires a torpedo.

A Small Matter of Pygmies

Hadji is not sure he can perform his levitation trick, as it's been a long time since he tried it. Come on, he does that trick in plenty of episodes.

In one scene, Race's three-quarter-length sleeves are much too short.

Dragons of Ashida

In one rear shot, Dr. Quest's collar is sticking untidily out of his jacket.

Quest talks in Race's voice.

Ashida's coat turns momentarily white.

Sumi's eyepatch switches to the wrong eye a few times.

One of Sumi's dragons prematurely loses its collar.

Turu the Terrible

The native loses his armband when Turu grabs him.

Although Hadji yells, "Get him in the net," neither of the boys makes a move to net the fish.

In this episode, we learn that Dr. Quest is an M.D., and that he smokes a pipe.

Race doesn't recognize the drawing of a Pteranodon. And he seemed like a pretty smart fellow...

Dr. Quest brought along rocket belts and a bazooka to look for a mineral deposit. What did he expect to find?

In one scene, Race has very different straps holding the rocket pack to his legs.

The Fraudulent Volcano

The old man who escapes at the beginning of the episode survives his fall from the cliff, yet we never hear of him again.

It looks like the opening bedroom window should hit Quest's elbow.

The henchman opens the window directly above Dr. Quest's head and drops a tarantula into the room. Yet we see the spider further down the bed crawling toward the doctor's head.

The entire Quest team is in pajamas when they rush out to douse the hangar fire. Only Race pauses to dress.

Simon 1 pulls down a scope to watch the Quest plane, but it shows the exact same image as the two screens directly behind it. So, why bother?

The seargent says that the parachute must've landed just around the bend in the road. Yet it looked like it landed directly in the volcano's crater.

Our heroes flee from the volcano without even looking for the seargent. Is he dead?

Race tells the boys to keep their heads down in the car, but they don't duck at all.

The bullets go right through the car roof; amazingly, no one is even winged.

Werewolf of the Timberland

The boys wear coats throughout the episode, presumeably because it's cold up north. Not so Race and Dr. Quest, although the former briefly wears a long-sleeved shirt.

When Blackie shoots the strut and breaks the log flume, it should run dry, but it continues to spue water long after it should be drained.

Race gives us his Dr. Quest impersonation.

Pirates from Below

Jonny's communicator appears and disappears throughout the episode.

When Race holds up two fingers to indicate the size of a six-inch seahorse, he's not even close to the right size.

When the villain commands, "Slow ahead," we see the picture moving closer to the underwater prober; but it's not the sub moving, only the camera angle.

Jonny says their direction is south-southeast. Looks closer to north to me.

Jonny comments that the villains' vehicles are the most modern hovercraft he's ever seen, although they look exactly like the Quest flying platforms from Werewolf of the Timberland

There are many pipes in the tunnel, all apparently at the same height. Yet, when Jonny grabs onto one, there are no others in view along the tunnel.

Jonny's hands are behind his back as if they are tied, but we see a moment later that they aren't.

Hadji hopes to learn some new trick from the scientists from Calcutta. Perhaps they teach him hypnosis, since this is the first (and only) episode in which he uses that skill.

One torpedo launches without a sound.

When one mini-sub sees the other crushed by the underwater prober's claws, why doesn't it stay higher, out of reach?

Attack of the Tree People

Hadji says,"Come on, let me loose," without moving his lips.

Chopper comments that the situation is a horse of a different color, to which Silky answers, "Yeah, green," referring to the money they hope to receive. Yet, they ask Quest for the ransom in pounds sterling, which are not green.

How'd the boys climb onto the log without seeing that ape on the other end?

Silky's black tee shirt vanishes a few times.

The ape's foot changes color when it jumps on Chopper's back. Later, one of the apes gets a color change to its ear.

Invisible Monster

When the invisible monster hits the electric fence, the prints on the other side of the fence appear instantly.

The first time we see Race in the rocket belt, the straps are not correct. Later, some of his straps are red instead of tan.

Hadji loses his eyebrows.

Dr. Quest tosses his blue paint bomb well before Race's, but Race's hits the monster first.

Although there is no vegetation anywhere near Bandit when he's burying his head in the sand, the nearby monster is surrounded by plant life.

Race uses a video communicator to talk with Quest, while the doctor uses a headset. How can Race see Quest's face? Quest isn't holding a communicator.

The switches on the console vanish.

Dr. Quest says, "For once, I'm really glad to leave." Does Cave Island have a special place in his heart?

Bandit's nose turns white for an instant.

The Devil's Tower

The lever keeps disappearing from the cable reel.

The balloon temporarily loses the trailing cable.

First Hadji's collar turns brown, then his neck is gold.

The negative space between Von Dueffel's arm and body turns brown to match his jacket.

The Quetong Missile Mystery

Why does Race fly the copter so dangerously low through the streets? It would be easier to trail a car if he flew high.

Dr. Quest deliver's Race's line of dialogue.

Quest loses his watch in the helicopter, then finds it in the missile control room.

Race knocks the sentry from Post 5 into the swamp. Yet, the man is later shown waking up on the platform.

The House of Seven Gargoyles

Why does the periscope go down, then come up immediately, then go down again?

In a far shot we see all seven gargoyles on the roof, but in the next scene, Dietrich is shown standing on the ground.

The sinister shadow of Dietrich extends around the corner, and all the other characters rightly cast shadows as well. But all these shadows vanish once Bandit finds the phony gargoyle.

The voices of the submarine crew are switched.

Why did Race leave the key in plain sight on the night table?

Race says the safe hasn't been opened, but all he really knows is that it is locked; it could've been opened and closed again.

Terror Island

The firecracker lands next to the curb, but when Bandit gets to it, there is no curb in sight.

Quest suddenly acquires a watch.

The way Race hands the note to Hadji, it looks like he was reading it upside-down.

The lever is missing from the cage door control.

Speaking of that control, it has three settings, but they don't perform the same function each time.

The guards in the jeep sure are losers. They give Race time to dash around the corner while they sit there holding a live grenade.

The Quest team takes Chu's speedboat to escape. So, what's Chu driving?

Monster in the Monastery

Hadji says he went to school in India...wasn't he a beggar boy, informally educated by Pasha Pedlar and an American Marine? He went to school, too?

"Only a yeti could bring on such terror," says the Raj Guru when he hears a blood-curdling scream. Really? How about a tiger? Or an avalanche?

Interestingly, nobody goes to investigate the above-mentioned scream.

Raj Guru says that the natives are afraid to use the ropeway...a strange choice of words. He's a "native", himself, isn't he?

The Chinese dragon looks exactly like the one in Terror Island.

When Jonny is grabbed by the yeti, he suddenly loses his coat.

We get a good look at the staircase in the ruin. There's no way it would take that guy that long to fall to the bottom.

A yeti with a mask chases Jonny down the stairs with his pistol drawn. Then the bald guy with no yeti mask says, "I have trapped one of them." Did he put his mask back on and remove it again? Or is he taking credit for another guy's work?

Jonny and Hadji hide behind a gong with two vases nearby. They then toss two vases at the yeti, but there is still one left.

When Race hears that there are approximately nine thugs to battle, he says the odds are just about right. That's a bit egotistical, don't you think?

The Sea Haunt

The footprints are nearly round, but the monster's feet are long and narrow.

Dr. Quest asks Race if he has his gun, even though it's plainly visible strapped to his hip.

Should one use a hose to put out a fire caused by a smashed lantern? Won't water just spread a kerosene fire?

Race tells Charlie to keep splashing, a very good way to attract sharks.

How'd Bandit get inside a coffin with the lid closed?

Hadji says the coffin on the end is moving. Actually, it's the coffin off to the side, which is not the same thing.

Dr. Quest is an amazing man. He seems to be an expert in almost every branch of science known to man. Here is a partial list: