Other mistake: When Christian Slater shoots 9 or 10 shots out of a 6-shooter, there is no possible way that he could have had time to reload in the time allotted.
Other mistake: When the nanny comes home with the tags, they call Jewel to get hers first. Jewel has a penis.
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 Happy hits the ball in the alligators mouth, he is on the complete other side of the lake where the gator is located, and there is a crowd of people blocking his view, but somehow he can still see through the people and over the lake, to notice the gator taking his ball.
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: 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: In the first scene with Randy telling Jamie Lee Curtis to turn around, the reflection in the TV never mirrors the actual position of Jamie Kennedy. (01:22:30)
Other mistake: Carolyn Stilton shoots Blondie O'Hara in the head and is lying dead over her dead husband. Just before the final scene starts she begins to open her eye.
Other mistake: Jack's parents were at a Halloween party when his mother went into labor. Later in the movie when he's asked by his teacher he says his birthday is September 12th.
Suggested correction: The movie doesn't specifically say this is a Halloween party. This may simply be a costume party which can and do happen multiple times a year.
As you stated, it doesn't say it's a Halloween party. In fact, there's signs in the room that say "Beaux-Arts Ball."
Other mistake: When the students are below deck having a meal, a glass pitcher of orange juice can be seen. Even though the boat is apparently rocking to and fro in the waves, the juice level stays still. Obviously it is the camera that is moving and not the set.
Other mistake: Look closely at the dead trooper's closed eyes. You'll notice during the length of the shot that his closed eyes move. Fast forward to make this more obvious. (00:37:55)
Other mistake: Vanessa is illiterate, but easily reads the Hi-Way Café menu. (00:48:35)
Other mistake: Early in the movie when Shale is screening the commercial for his "services," the rolling text describing his abilities lists "Helicopter Repelling" instead of "Helicopter Rapelling".
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: As Sylvester Stallone explodes the grid to come up in the tunnel, the car on top is like a lightweight car, it seems to be stuck to the ground. (00:45:00)