Revealing mistake: When Kevin Bacon is talking to Courtney Love on their cell phone and he hangs up on her, a dial tone can be heard on Courtney Love's phone.
Revealing mistake: When the boy runs from the jumping spider he crosses the road, which makes the eighteen wheeler lose control and it jacknifes. You can clearly see a set of tyres are moving with the right direction of the truck, and there are a set of tyres sliding. (00:40:55)
Revealing mistake: The alarm clock stops on its own after just 9 seconds of beeping. Real alarm clocks go for longer / forever to make sure you're awake. (00:06:05)
Revealing mistake: In the shot where Sandra Bullock revisits the site where she was dumped years ago, you see her car pull up on what is supposed to be a moonlit road. As she gets out of her car, her shadow goes from left to right across the screen but the large tree on the left is casting a shadow in the opposite direction. As she passes the front of her car, no shadow is cast from the headlights and when she reaches the edge of the road, her shadow disappears completely. (00:21:25)
Revealing mistake: When Anderton first sees himself killing Leo Crow in the precog vision, pay attention to the shot when he says "no". The reflection of Jad in the Hi Tech screen doesn't match with his movements.
Revealing mistake: Terry gets drugged. A needle in the neck. Yet she is able to run over to Mike like the drug had no effect on her.
Revealing mistake: On the FDR, when Doyle tries to thumb a ride in the rain, the only vehicle using wipers in the 'downpour' is the one that passes Doyle. All the other vehicles in the background driving northbound on the dry FDR are not, and in fact driving beyond the reach of the crew's artificial rain in the foreground. (00:10:30)
Revealing mistake: When Webster is hiding under Becker's bed and Rob/The Djinn drops Joe's body on the floor, look at his neck. You can see he still has a pulse. (01:03:45)
Revealing mistake: In the scene where Joey is arrested, they handcuff him. When the police pulls him on his feet, you can see that the handcuffs are not on, but the officer is just holding them. (01:36:05)
Revealing mistake: When Dormer fails to pursue Finch during the log chase scene, he climbs out of the water by a ladder. If you look at Dormer's back as he gets out of the water onto the dock you can see an outline of the life jacket Pacino wore to film the scene. You can see the outline again when he turns around and walks up the walkway. (01:00:49 - 01:01:11)