Revealing mistake: When they are about to start that freezing machine, the dead body where they took the key from still looks fresh as compared to the others they examined that are in an advanced state of decomposition.
Revealing mistake: When Ashley Judd slams Tommy Lee Jones' car and tips it over, she drives off and skids dramatically to a stop. Just before she skids, you can see several skid marks on the ground from practice or previous takes.
Revealing mistake: Jude Law is inside the game and he's supposed to be American. When he finds out that his bio-port has been infected he says his next line in his normal British accent. (01:20:10)
Revealing mistake: When Machine slits Max's throat no blood comes out of the wound. (01:21:55)
Revealing mistake: During the opening sequence, when the fish and game officer is just about to be attacked while looking inside the nest, there's a clear reflection of his lower body as the camera moves closer from behind him. This reveals the diver is in some type of tank, otherwise, this could be a piece of equipment, like Plexiglas (or similar,) put in place within a real body of water for filming purposes.
Revealing mistake: Pnub's (Elden Henson) head in the scene where Anton kills the two cops is obviously animatronic, it's eyes are clear blue and Pnub's eyes are brown.
Revealing mistake: After Christine gets out of the shower, we hear the director cue her by saying, "Go," before she walks past the camera.
Revealing mistake: During the fight scene on the riverbank when the white haired man lands on the pavement, the "concrete" pavement moves.