Corrected entry: In the restroom shootout, Harry is fighting the terrorist in the green jacket. He takes his gun and shoots the second guy, with the beard and brown jacket, who then fires off his gun in the way dying bad guys do. The gun he is holding is a USP Tactical Machine Pistol, which is silenced, but you can hear the loud shots from the gun as he dies.
Corrected entry: The first time Arnold commandeers the Harrier, it's lifting from the pavement hitting cop cars etc. When he finally gets control, the angle changes and the Harrier is now lifting from above the water.
Corrected entry: When they are in the Florida Keys Arnold hands Helen the MAC-10 machinegun. She then fires it and it falls down the stairs continuing to fire and killing bad guys on the way. The only possible way this can happen is if it is stuck on auto-fire. When it reaches the bottom of stairs it stops - obviously it has ran out of ammo. A couple of seconds later you see Arnold making a running dive to the same machine gun and he picks it up - does not reload and immediately fires it at more bad guys.
Corrected entry: When they are standing at the top of the dam, the first time you see the dam it's dry. The next time you see the dam (30 seconds later) it's wet.
Corrected entry: When Arnold is on the plane after getting caught, he is shot in the back of the neck with some tranq gun, if you look as he passes out, you can see the girl talking spilling her wine all over her as it fades out.
Corrected entry: During the final action sequence, we see a janitor in one of the buildings, going about his business. With that kind of a threat, all buildings in the area would have been completely evacuated.