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: Near the end of the closing credits, when the Warner Bros. Copyright appears, you'll see the very first word "All" spelled incorrectly as "Al" in "All material is protected by Copyright Laws of the United States and other countries throughout the world." (01:26:40)
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: 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 Klump is being replaced by Buddy Love, and the guy is putting the new name on the door, it doesn't make sense that the name is readable from the inside of the office. Normally, names on the doors would be put on the out-side, so that passers-by would be able to read it. The name being applied in vinyl on the glass door is being put on, on the wrong side of the door.
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: 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.
Other mistake: The power is cut to the satellite facility near the end, but Sheen manages to raise a powered window curtain to look outside.