Other mistake: When examining the craft in the hangar, it's reported there are no seams or any way in or out, but when the camera focuses on the man's hand, you can see the seam where the hatchway will be.
Other mistake: As the plane is beginning to crash, Chuck grabs the watch with his girlfriend's photo in it, and somehow it survives everything, but how? He had the watch in his hand, but in many shots we can see Chuck with both hands open as he needs them to hold onto something. He didn't put it in his pocket, he didn't have time.
Other mistake: The subtitles of the international version translate a few things completely wrong, including, when the body of the warden is found, "There were three men!" instead of "It happened at half past three." (00:04:25)
Other mistake: When Rambo gets killed, the lethal shell comes out of the right barrel, but in the earlier close-up on the villain gloating after maiming Rambo's legs, the right barrel was the one that already fired, smoke coming out of it. (00:32:40)
Other mistake: Harry Shannon tells Mark Kaminsky that the alias he is giving him is that of Joseph P Brenner which to a guy with a long rap sheet. Paulo Rocca later asks Joey, "how the hell is it you never did any time?" (00:20:56 - 00:39:53)
Other mistake: The spot light from the school building spotted the scuba divers with yellow oxygen packs, but the guerrillas did not respond.
Other mistake: In the scene following the piano debacle Paul Reiser's image is reversed so his name tag is on the wrong side and backwards.
Other mistake: Walter Paisley is cleaning the floor and encounters the first robot. The whole reason the robots are patrolling at this point is that the shopping centre is supposedly closed to customers, as it is nighttime. However in this scene you can see quite a few people shopping on the upper tier of the mall above Paisley.
Other mistake: When Turnip runs off with a horse suppository up his hindquarters, the policemen shoot at him being all in a straight line with each other - in fact it really looks like they should be shooting at each other if those guns were real. (01:05:55)
Other mistake: Taylor parks his car in Cuesta Verde, next to a couple of crates next to the pilot's door. He steps down and walks straight without looking down, which is impossible for he should have tripped.