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Factual error: There is a shot with Wesley Snipes and Gary Busey aiming one another just to pull the triggers and discover that the guns are out of ammo. In fact, after the last shot (of the pistol, not the movie) the slide of a semi automatic pistol is retained open by the empty magazine, and doesn't return forward as we can see in the shot (of the movie, not the pistol). The reverse mistake is very common in movies, when the armorer loads just one round to be shot (in the movie as well as the gun) and the actor keeps fighting or menacing with an unloaded, breech opened gun.
Deliberate "mistake": Just before landing on the police headquarters roof, the 'hijackers' are shown in semi-sunlight right after jumping out of the plane, probably to show how many jumpers there were. The immediate scene afterwards, they are all shown in pitch blackness coming in close to the building, and then landing on the roof.






