Other mistake: When Connie is waiting for the President the first morning she is reading USA Today. On the back there is a weather map and it is blue and green, the colours for cold in USA Today. It was a hot July day! (00:06:15)
Other mistake: Although the film is set in Oklahoma (and north of Oklahoma City), the roads are marked by Texas road signs.
Other mistake: If the bullets from the super gun move at just under the speed of light, how come the bad guys can't hit him or the girl? The bullets would arrive almost instantaneously and that would mean minimal compensation for them running. Plus the guy had them locked on when he shot.
Other mistake: When the general passes the clipboard to the President to sign the nuclear release, the clipboard is actually upside-down. (00:55:55)
Other mistake: After Guy gets hurt in the warriors/ducks game, the scoreboard is shown. It says that there is 15 seconds left in the third period, when it is really the second period.
Other mistake: Speaking to General Hershberg (Michael Moriarty) in his office, Nat Serling (Denzel Washington) implies that it was easily discoverable that the US tank was destroyed by "friendly fire" because the US is the only country which uses "uranium depleted" shells. The correct term is "depleted uranium". Maybe Washington flubbed his lines.
Other mistake: When the killer and Segal are fighting in the last scene, and the killer is thrown out the window, you can clearly see the black shards on the window bend.
Other mistake: As Plisken escapes in the hijacked chopper, Quervo Jones picks up a bazooka and prepares to fire on it. As Fast Eddy shoots him through the chest, watch the bazooka. You can see right through the barrel. In other words, there is no ammo in the weapon. (01:25:05)
Other mistake: When Nicolas Cage is chasing Sean Connery in the yellow Ferrari, someone already mentioned that the windshield breaks more than once and in the next shot it's in perfect condition again, well I say forget even that. When Cage drives onto the sidewalk and crashes into the meters, the windshield should have been completely destroyed, not cracked. And the same goes for the hood of the car, which is in perfect condition in the next shot.
Other mistake: During a chase, Gibson makes a left turn at an intersection causing two girls to suddenly lunge backwards to avoid getting hit. The girl with the long black hair turns to her friend and smiles. This was most likely because she just successfully played a part in a big movie, but I don't think she'd be smiling at that moment. Most of the people in that shot don't react normally but are more explainable given the New York setting.
Other mistake: Shooting two forty-fives at once is hard. Willis must think so too. One gun fires blanks and the other gun operates like a real pistol, even emptying out shells, but is not firing. This is very noticable in slow motion during his first standoff.
Other mistake: The Mongolian guy is supposed to be knocked out cold - however, he appears to smile upon being knocked down.
Other mistake: When the military convoy is attacked by the terrorists, the terrorists use weapons to blow up the Jeeps. Notice that the first Jeep blown up is parked next to the white guard rail and a sign post that show 36 on it. The same footage from a different angle is used for an another explosion.
Other mistake: Right after the second agent gets out of the drivers side door of the car he rolls down the middle of the road. No cars in the background seem to stop or move out of the way. Also just as he is thrown watch the close up shot with Sandler in the backseat and Wayans driving, the car that would have hit the agent just keeps driving behind them the entire shot.
Other mistake: When Kate is introduced by Senor Ortega, she is introduced as Kate Riley, but the credits list her as Kate White.
Other mistake: When Peyton/Darkman returns to his home, you can see that most of the footage of him arriving and experimenting in his lab is actually repeated footage from the second film, mixed in with some new footage.