Revealing mistake: When the blond lady dies, she is seen in a body bag. Look at her nostrils as they widen, revealing that she is not quite dead.
Revealing mistake: In the scene in the toilet where Chip (Jim Carrey) beats up Robin's date (Owen Wilson), you can see throughout the whole of the fight that Owen Wilson is either laughing, or trying not to laugh.
Revealing mistake: In the scene at the end of the movie when the detective is listening to the Senator's confession on tape, there are no speakers attached to the stereo.
Revealing mistake: Just after Roy Nord gets killed in the mid river passage collapse, we see one of the criminals and Kit come out of the hole, and the black criminal get thrown back by a big flame explosion. When he hits the wall, it seems to bend. (00:50:35)
Revealing mistake: Look at the gun fired behind Shale at the firing range. The person doesn't pull the trigger, there is no flash, the slide doesn't move, there is no smoke. But the gun still kicks.
Revealing mistake: When the Teacher and Juliet make love there's a sheet wrapped around the teacher's hips, and after the climax his sweaty hair dries between shots. (01:15:40)
Revealing mistake: When Ethan uses the magnetic screwdriver to undo the screws holding the grille to the air-vent in the NOC list room, the spindle that is actually turning the screw is visible after it falls out.
Revealing mistake: When Kevin shows the Mayor the Times editorial about the judge he quotes a phrase from the article about whether the man would be a judge if not a former law partner of the mayor. Unlike many newspaper articles shown in films where if you read the article text it is actually jibberish, here it is a legitimate article criticizing the way judges are elected, but some parts are repeated, and it states nothing about the judge being a former law partner of the mayor.
Revealing mistake: After Seagal and the student jump off the window they land on the floor and for a brief but obvious moment one can notice it's not Seagal but his stunt double.
Revealing mistake: When Kiki's legs "reverse" at the end of the film as he runs off, watch closely. It is clear the effect was achieved through some shoddy image-manipulation. His clothing and hands "warp" slightly a few times around his legs.
Revealing mistake: When "Roy" pushes Martin into the wall during their first meeting, you can see the wall shaking on impact. (01:14:30)
Revealing mistake: When the policeman is shot on the roof of the observatory and the police cars drive across the grass, you can see the tyre marks in the grass from previous takes.