Revealing mistake: In the swimming pool scene, when David is sitting at the bottom of the pool, you can clearly see a scab on one of his knees. (00:43:00)
Revealing mistake: After Carmen rescues Juni, as they fly over the city she says, "Hang on butterfingers." In the following close-ups, where is the handcuff with the broken chain on Juni's wrist? He is not wearing it on either wrist in any of these close-ups. It's obviously back in the following shots. (00:41:45)
Revealing mistake: After the trained chimp is shot and is crawling into the cage, they show a shot of an ape turning around. You don't even have to look hard to see it but there's a two inch strip all the way down his face with no makeup. Clear as day. (01:41:30)
Revealing mistake: When Yulaw and Gabe are having a confrontation next to the MRI machine, Gabe jumps across the table and kicks Yulaw. Here you can see the attempt at face replacement on the stunt double as Gabe, which looks fake and plasticy. (00:34:50)
Revealing mistake: When Kay-Em kicks Jason in the face during the fight sequence, you can see Kane Hodder's goatee. (01:03:40)
Revealing mistake: This film was shot in Page Arizona with is pretty far north in the "high country". When they first drive up to the meteor side, there is Saguaro cactus that are only a couple of feet high with huge arms and a neon greenish color. These only grow on the desert floor in Arizona and they certainly are not neon colored. Additionally, the arms don't start appearing until they are much taller as they grow them to balance themselves since they have a very shallow root system.
Revealing mistake: When David is sitting in L.E. at the end and the camera is zooming in on his face his mask changes. In the very last shot of him just about to pull it off it's much wider/looser so it'll come off easier.
Revealing mistake: When the raptor in the InGen compound calls for help, the shots of the raptors responding are shots taken from other scenes in the movie.
Revealing mistake: Have a look at the shot of the rear part of the train exploding as the locomotive pulls away from it. If there was ever a more obvious model shot, with cheesy, jerky bouncing toy trains and Action Man (TM) dolls, then I haven't seen it.
Revealing mistake: When Gretchen gets run over, you can tell that a dummy was used as the car's wheels pass over her. The position of her head changes between shots and her body seems a little too still for a living person who's just been run over. She should have been tossed a few feet or maybe even gotten caught under the car's wheels.
Revealing mistake: When the monsters approach The Cyber gang outside the arcade, Cyber Scooby (who wears the red color) is seen in a blue color in one of the shots facing the arcade.
Revealing mistake: When the group comes across the first ass-blaster, it hops out from behind the fence. Pay attention to its right leg when it jumps out and you'll see a rock on the ground just appear behind it. After it spots them, it stomps a few times. While it's stomping, pay close attention to the rock and you'll see it and some of the ground around it just disappear after a few frames. This rock also isn't visible in any other part of the scene. (01:01:10)