Revealing mistake: During the hotel scene where Arnold is on the horse chasing the bad guy on the motorcycle, keep your eye on the carpet. As the bike clears a path through the lobby, you can see tyre marks all over the carpet where this shot has been practised many times. (00:36:00)
Revealing mistake: During the shoot-out in the restroom, the villain fires shots down the length of stalls. Then as he walks down kicking each door open there is a shot from inside one of the stalls. You can see where the explosives were taped to the back of the door to make the gun shoot holes. There is residue on the back of the door and all of these rectangular clean area where the holes ended up being. (00:31:50)
Revealing mistake: During the scene where Arnold's character is escaping from the mansion at the beginning of the movie, there is a part where he is running down a snowy hill through trees. At one point during the hill scene, Arnold does a flip head first. When he lands the flip, you can clearly see the stunt double's face as he turns to shoot at more bad guys. (00:13:30)
Revealing mistake: After the bathroom shootout, when Harry Tasker has his team contain the terrorist leader in front of the building they're about to chase through, just before the terrorist rides the motorcycle through the front door, if you watch carefully, you can very clearly spot Arnold Schwarzenegger's double on the horse. (00:35:35 - 00:36:40)
Revealing mistake: At the beginning of the movie, during the scene were Arnold is being chased by the 2 Dobermans, the dogs jump up to get him and he knocks them out by bashing their heads together. Look closely as the dogs fall because you will see that they are obviously two rubber figures of dogs and bounce when they land. (00:12:10)
Revealing mistake: When all the terrorists are firing their guns at the sky near the end, one of the men is clearly pulling the trigger, and empty cartridge cases are coming out, but there is no muzzle flash like the other guns.
Revealing mistake: In the restroom fight scene, the first villain shot by Arnold randomly shoots his gun as he is dying. Some of the stray bullets hit the urinals. As the camera angle changes to show the bullets hitting the urinal, large flames can be seen as the urinal explodes and falls to pieces. There must have been a small explosive used to make this happen, as the bullet impact wouldn't do this. (00:30:00)
Revealing mistake: Right after the horse motorcycle chase scene, at the next day's debrief, there is a piece of file footage showing the lead terrorist. As per normal practice, there are numbers running in the clip to show where they are in it, however, even when they pause, the numbers continue to run. Most visible when Trilby asks why he's called the 'sand spider'; they pause the tape and yet the play numbers continue to run. (00:41:55)
Revealing mistake: More rounds come out of the Vulcan than are carried by real Harriers.
Revealing mistake: In the scene where the harrier shoots a missile and blows up the bridge you can clearly see that it's all miniature, but if you didn't know, you could tell it by the crash barrier that is obviously made of some sort of rubber - it bounces up and down during the explosion (you see it in the frame where the car crashes down on the bridge again). (01:54:10)
Revealing mistake: In the scene where the limo crashes off the bridge after Hellen Tasker has been picked up in the chopper, the camera pans back to show a strut of some sort is falling from below the limo. (01:58:35)
Revealing mistake: When Aziz (Art Malik) shoots at Harry (Arnold) in the bathroom, he has a rifle with two magazines taped together. If you look closely, the second magazine taped next to the one in the gun is empty. He then reloads the gun by flipping the second, empty, magazine and loading it.