Revealing mistake: In the scene at the end of the very first battle, where Imperial troops have just taken control of Princess Leia's rebel ship, Darth Vader breaks the neck of the Captain Antilles and tosses his body to the wall. The "dead" Captain puts up both of his hands to avoid slamming his face into the wall. (00:05:40)
Revealing mistake: While Dr. Wentworth is driving his car trying to shut off the loud music on the radio, the dashboard shows that the car's gearshift indicator is not in "D" for "Drive."
Revealing mistake: The shot of the two nuclear missiles being launched is used twice, just reversed. They seem to have changed the saturation slightly in one of them to make it look different, but there are identical clouds at the top left/top right in both shots, ruining the trick.
Revealing mistake: In a scene where Frog is riding with the Bandit, she's resting her head on the center gearshift console. Although they're supposed to be cruising down the road, the automatic transmission shifter is in neutral.
Revealing mistake: While the German officer, played by Hardy Krüger, is in a pill box reporting back to his headquarters, with the bridge seen in the background, rush-hour traffic can been seen on the bridge.
Revealing mistake: At one point in the movie, dumptrucks are sent in to contain the Mighty Peking Man. You can tell that these, like most of the movie are toys.
Revealing mistake: When the UN team arrives in the Gobi desert, there's one shot where the helicopters and trucks are parked. They're supposed to be moving, but you can tell from the way the flags are moving that the wind is only coming from the helicopters.
Revealing mistake: Just after the helicopters crash during the chase with the crop duster keep a close eye and one of the helos is still in the shots flying.
Revealing mistake: Near the end of the film, the mayor, played by Jim Backus, is speaking to Elliot the dragon, who is invisible. The mayor has a cigar in his mouth and smashes it when he turns to greet Elliot. The scene is accomplished by having Backus turn and smash the cigar into a large pane of glass. However, the reflections on the glass are visible.
Revealing mistake: When the Black Knight kills the King's champion with his axe, you can see the flash and smoke from the charge which blows the armour apart. (01:32:00)
Revealing mistake: During the first rollercoaster accident, the bodies in the cars are obviously dummies. (00:13:35)
Revealing mistake: In one scene, focused only on an actress's hand holding a lit cigarette, it dawns on you that the smoke is curling back downwards and the cigarette is miraculously getting longer. This is a flipped shot, it is seen backwards.
Revealing mistake: In the beginning of the movie when Orca is about to hit the great white shark out of the water the stick that holds the "head" of the great white is visible as it swims by.
Revealing mistake: When the bat flies into the bathroom and attacks Suzy you can see a string attached to the fake bat. (01:19:16)
Revealing mistake: At the beginning, when Gail is attacked by a moray eel - we don't see it, but that's the assumption - and she is banged against the sunken wreck of a ship, and then, when she is released, her mouthpiece is not in her mouth and she tries to swim to the top as fast as she can - all of this is done by a stunt double, understandably, we can see this by her hair, which is much thinner and straighter than Jacqueline Bissett's hair.
Revealing mistake: After Ethel has died and Brenda is crying over her, there is a slight twitch in Ethel's eyes.
Revealing mistake: The supposed deceased dog is breathing as Rack and spider lady examine him.
Revealing mistake: During the demonstration of the Iron Claw technique in the opening credits, the master grips two bamboos; as he does it, you can see they are already cut before he applies the technique that supposedly splits them. (00:03:55)
Revealing mistake: In the beginning when Shockley pulls up and the Jack Daniels falls out you see it hit a wet mark from the previous take.
Revealing mistake: While the plane is almost upside down, papers and stuff fall inside, but one can notice that it's the actors throwing the papers, not gravity making them fall.