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: Towards the end of the film, as the two kids are escaping through the subway being guided through the night vision scope used by the army major, they are virtually blind and have to pick their way through dead bodies, escalators etc. This seems a bit unnecessary as the M4 rifle to which the night vision scope is attached also has a torch attached to the RIS rail. Military spec torches are extremely bright - why not just turn it on? They can't be worried about being spotted, because they are shouting at each other, not concerned with what might spot them.
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.
Other mistake: At the beginning of the movie, a sniper is preparing to assassinate the Chinese Ambassador, who he has in the cross-hairs of his rifle. After the shot is fired, we see the sniper rappelling down the side of the building, which is at least 17-18 stories tall. When Jackie Chan jumps out of the building across the street, we see that he and the ambassador were on the bottom floor, far back from the window. There is no way the sniper, from that angle, would be able to see his target in his sights.
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: When Mike rams up the backside of the challenger, the girl driving the car loses control and turns hard towards the left, the front tires aren't pointing forward down the road so there was no way she would have recovered from this. In the following shot after her closeup she's driving straight. (01:33:40)
Other mistake: In a scene when Deborah Martin takes a photo in the mirror the camera's position would'nt allow for the photo to be taken properly, as it does later on in the film.
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: When Wray goes to save Cherry from the hospital, he puts on latex gloves to stab the infected. But after he gets Cherry, he stabs a zombie with his bare hands. (00:51:15 - 00:53:25)
Other mistake: Chris' leg cast was thigh-high. When he got out of bed (and used crutches), his cast was OVER his pants. His pants' leg did not appear to be cut off - it was securely under the cast and never changed despite all the fighting/activity he engaged in. (00:36:22)