Other mistake: In the beginning of the film where the truck with the machine gunner and the driver is shot, the truck goes out of the road and falls over, but there is no machine gunner falling of the cargo area nor is there any driver falling out from the truck.
Other mistake: When Nancy finds the trapdoor from the attic, she goes down a ladder and gets onto the other floor. She walks a bit and goes down another ladder then looks up and Ned throws the flashlight straight down to her.
Other mistake: At the beginning of the New York chase sequence where Bourne is walking down the street, you can see an Asian man smiling right into the camera for a second.
Other mistake: When Martin Freeman punches in the numbers on the telephone to call Steve Coogan, the numbers he enters are not shown on the telephone's screen.
Other mistake: There's a scene where they turn a wheel to control the flow of water into a much larger chamber. The cavern that is presumably completely filled with water (water is dripping off the ceiling) is massive. The flow from the smaller chamber into the cavern is relatively small. They enter moments after stopping the flow to find the cavern is drained. It should A) either take the cavern a very long time to drain or B) the cavern should never have been fully filled with water.
Other mistake: About a third of the way into the film when Nick leaves school and is running home he gets hit by a car and run over by a truck. Before both events the vehicles horns can be heard, as if the drivers are warning Nick to get out of the road. If Nick was invisible there would be no reason for them to honk their horns at all.
Other mistake: Near the end of the film, when Jack Doyle is being arrested, the Mass. State Police troopers' badges and shoulder patches are not what is actually worn by this police department, although the remainder of the uniform appears to be accurate.
Other mistake: It is said Jamie has no alibi in the beginning scenes of the movie, and the detective immediately drills into him as if he committed the murder. Yet Jamie did have an alibi, he was out getting Chinese food and had it been checked out with the restaurant. No reason for Jamie to prove his innocence. (00:10:00)
Other mistake: After falling in the pit of water at the end, there is at least one shot (if not more), only a minute or so later (when Turner is stabbed in the leg by Julie), where Kale's shirt appears to be completely dry, when it should be still quite drenched.
Other mistake: The film's set in Seattle but was filmed in Canada. This is evidenced by things like a Canadian red striped postal box as well as cars with Canadian license plates.
Other mistake: Mr Brooks hands over the keys to Mr. Smith after closing the cemetery gate behind them, but never retrieves them back after killing him and pushing the body down the grave.