Revealing mistake: Michael Douglas pulls up to the curb to park his car. When he opens his door, it hits a fire hydrant, which moves! This is very easy to spot. (01:08:50)
Revealing mistake: During the scene where Arnold's character is escaping from the mansion at the beginning of the movie, there is a part where he is running down a snowy hill through trees. At one point during the hill scene, Arnold does a flip head first. When he lands the flip, you can clearly see the stunt double's face as he turns to shoot at more bad guys. (00:13:30)
Revealing mistake: When Scooby, Shaggy, Mary Jane, and Daphne go crashing through the window while running from the two monsters, the falling glass and broken window frame pass right through the CGI Scooby. (00:42:30)
Revealing mistake: When Eli and Klitz are being chased by Mule, Eli and Klitz go over the railing and land on the table. After that when Mule lands on the table you can see the table break a split second before he lands on it.
Revealing mistake: When Augustus is leaving the factory, he is wearing a brown colored glove on the hand he gnaws on. You can see the seams in the glove.
Revealing mistake: After Joe blows up the A-Bomb, the film is reversed for a second as is evident by Joe's "I Choked Linda Lovelace" shirt.
Revealing mistake: When Shane is fighting the two ninjas, they are armed with expandable batons, which are tubular hardened steel. During the fight sequences you can see the plastic batons bending repeatedly.
Revealing mistake: Even though Drillbit's pinkie was supposedly cut off by the sword, you can see it is just bent out of sight.
Revealing mistake: When the megalodon attacks the yacht the party goers jump off the yacht, and some of them reach the large round safety raft. To the raft's right, there is a visible yellow line attached to it so it doesn't drift away for the shots.
Revealing mistake: While the guys are going for their physicals, there's a scene in which blood is drawn and you can clearly see the tube connected to the end of the syringe pumping fake blood into the container.
Revealing mistake: When the TVs explode, the glass is very fake and "cardboardy".
Revealing mistake: When the professor is trying to find the gremlin, he is in the room with the movie playing. The projector that is playing the movie is actually moving backwards. (00:44:35 - 00:47:35)
Revealing mistake: In the part where Amelie gave back the photo album to the bloke in the fun park, when he finally gets to his bike, you can see people in the background staring intently at the filming. (01:12:40)
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: In the scene where Chuck finds Bill in the morgue vault listening to the recording of Chuck telling him to shut up, take note of Bill's thumb on the rewind button of the tape recorder. You can hear the tape recorder rewinding to replay the words, "Chuck to remind Bill to SHUT UP" multiple times but Bill's thumb does not move at all until he turns the recorder off. (00:30:00)
Revealing mistake: When "Pop" dies, you can tell he is still breathing, especially if you fast forward the scene. He is just doing it very slowly, but you can see his chest move up and down.
Revealing mistake: In the scene where Jane is trying to run over John with her car, she jumps from the driver's seat while John is in the back of the car. Right before the car crashes through the fence, you see John through the back window. You also see a head in the driver's seat, even though no one is supposed to be driving the car.
Revealing mistake: On the way to the party, near the end, they are supposed to be in Alabama when the car gets pulled over, but the officer's badge, shoulder patch, and car all say Georgia State Police. (00:51:45)
Revealing mistake: When Goldie Hawn pushes Kurt Russell off the boat you can see he has flippers on in the water.
Revealing mistake: Doesn't it seem odd to anyone that the crops hadn't been reaped by Thanksgiving in South Dakota?