Other mistake: Luke shoots Jasper's finger off, but if you look closely, you can see the bullet only hit his wrist.
Other mistake: In the standoff in the bar, Robert Patrick fires about 22 rounds from his handgun, then runs outside without reloading and fires even more into the propane tank under the bar. No way his gun holds that many bullets.
Other mistake: At New York ATC, the radar shows American Airlines Flight 11 disappearing over Manhattan, indicating that it has just crashed into the North Tower. This occurred at 8:46 a.m. Around a minute and a half later, Sgt. Jeremy Powell at NEADS directs the scrambling of fighter jets in search of American 11. He states that the time is "0846" (meaning 8:46) - should be 0847. (00:34:55 - 00:36:17)
Other mistake: Why are the guards carrying that useless glass armor? Glass is very heavy, so it is not comfortable; the armor isn't shock proof, because it breaks even if they just fall down; and it isn't bullet proof, because the guy with the AR-15 shoots right through it.
Other mistake: The boy fires a bullet on the right side of the bus, but she is shot by a bullet entering through a window on the left side where they were sitting.
Other mistake: Why is it that, at the wild party, the guys at the barn are shocked to find out how long Simon's "unit" is? Didn't they see it when he showed up to the fancy ball with only a black tie on?
Other mistake: François Cluzet and Marie-Josée Croze are husband and wife who grew up together and have been in love with each other since they were kids. They are shown in flashback scenes when they are kids as obviously being the same age. Yet it is obvious to the viewer that Cluzet is at least a generation older than Croze (15 years to be exact when I checked on IMDB.com) in the time that the actual story takes place in the present.
Other mistake: When Mike stops time to hit his boss, he starts getting off the desk. There's a bottle of water on the desk, however, the water is moving around from Mike moving on the desk. How can the water move if time is frozen/paused?
Other mistake: When Malus is talking to the female cop about the station wagon crash, he asks her who the woman and child were, even after she has told him that there are no bodies to identify, and no car registration.
Other mistake: When the glass in the Range Rover gets broken, the front window and passenger window shatters as normal automotive safety glass should. However, the driver's side glass gets broken into large jagged shards, instead of smaller pieces as would happen with any kind of auto safety glass, whether tempered, coated, or laminated.
Other mistake: The girls are invited to the cool party where the cool kids go. They are discussing it in the hallway, pitching a non-existent boat party. Throughout the scene, extras just keep walking back and forth to make the space look like a busy school. A guy with a loud green Hawaiian shirt carrying a clipboard is particularly noticeable. (00:02:30)
Other mistake: In the first microwave scene, Roddy press the random buttons (4,6,5,3,2) but the microwave only shows 3 seconds, and the popcorn already popped within those 3 seconds. (00:02:55)
Other mistake: After the piano is delivered to the Girl's house, we see her mom cooking. There's obviously nothing in the pan despite her vigorous stirring. (01:19:35)