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: 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: During the scene on the beach just after the collision of the two bikes we see Scott and Cruise flying together in a big hug, but if you see the short shot when the black bike starts to explode frame by frame you will actually see a lonely man with his arms wide open.
Revealing mistake: When Memphis delivers Elanore to Calitri, he gets punched and falls to the ground. At his feet you see orange tape as stage markings. (01:38:15)
Revealing mistake: This mistake occurs in the beginning of the film where the bandits rob the train. When Jackie is standing on the coal (or was it wood?) car you can see the train is passing a modern sign (you can see it on the right).
Revealing mistake: When the team captain gets in the car accident, if you look at the damaged car right after it is hit by the truck you can clearly see the stunt driver wearing a black motorcycle helmet.
Revealing mistake: You can see the plane intact even though it has exploded. It stays complete, there's just fire around it. (00:18:55)
Revealing mistake: Jennifer swipes her card the wrong way at the studio and the door opens anyway. (00:57:15)
Revealing mistake: When Bruce Willis is in the hospital, the doctor comes up to him and asks Bruce to look at him. The doctor proceeds to get a torch out and shine it into his eyes. Yet there is no light coming out of the torch. (00:10:25)
Revealing mistake: In the scene when Rusty hits Chip with the lamp near the end of the movie, you can see the lamp miss his face.
Revealing mistake: The pastor knocks down a large wooden cross in his church with what sounds like a hollow Spalding ball. That cross must not be made of very sturdy stuff. Actually, it looks like the bottom of the cross was not affixed to anything. A stiff wind would have knocked it over. (00:54:22)
Revealing mistake: In the scene where Rocky and Bullwinkle are walking through the university with Kenan and Kel (right before they come across the anti-moose protest), Kel's right arm passes through Rocky's left several times.
Revealing mistake: When Green Willie's medallion deflects the bullet coming out of the shotgun, the second shot kills him, but there is no bullet hole.
Revealing mistake: When Chuck is writing on the rock waiting for the wind to change direction, you can see that when the wind changes direction the trees behind him are duplicates.
Revealing mistake: Many times throughout the movie, people are shot and they bleed, but their clothes don't have holes from where the bullets hit them. The most noticeable examples are when the teacher is shot at the end, and when the big gun fight between the girls breaks out in the lighthouse.
Revealing mistake: When Jonny is running away from Terl in the mall at the start of the film, he goes through several panes of glass, smashing through them. One of them breaks up before he hits it.
Revealing mistake: When Daniel is being chased along the rail tracks, both the Peugeot and the Mitsubishis' wheels change from road wheels to train wheels (with fake tyres on) and then back again when they move back onto the gravel. Clever cars... (01:11:05)
Revealing mistake: The boulder, which comes rolling down the hill in the beginning of the film, is a fake. Fair enough, it would be too dangerous using a real one. A real one, however, would not bounce off the water of the pool as briefly can be seen.
Revealing mistake: In the scene where the three escapees are jumping into the train, when George Clooney jumps up you can see that the chain linking him to Delmar gets longer. (00:05:10)
Revealing mistake: When Charlie shoots the cow there is no bloodshed at all, even though the cow is supposed to be alive. (00:31:20)