Continuity mistake: Arnold goes to the gay bar to solicit the help of the guy he saved at the beginning of the movie. The guy is wearing a white shirt and a vest black/gold lamay. During their conversation he takes off the vest, then it cuts to another bartender. When it cuts back the guy has the vest on, another shot and the vest is off again.
Continuity 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.
Continuity mistake: Even aside from the ridiculous recoil that a railgun would cause (yeah, I know they don't use gunpowder, but there's got to be SOME opposite movement, surely), how come when the darts (bullets, whatever) go straight through people, they still get thrown backwards? The passage straight through them means minimal energy being transferred to them, and as such they shouldn't be hurled backwards that much.
Continuity mistake: Arnold dives to save the girl under the lid of a fridge. When all the drill bits are shot at him with his hand above the fridge door, none hit his hand. But in the next angle one penetrated his hand. Then in the next scene, when he's driving the van with both hands and when he swipes the credit card the wound appears and disappears.
Continuity mistake: After the court scene, when Arnold and Vanessa are making their exit toward the van, they get in, the van explodes and the camera pans to the underside of the van, showing Arnold pulling a manhole cover closed. The manhole cover was not there when they showed the van from a distance and they didn't have enough time to get in the van and escape through the bottom. Also, because several seconds passed before he closed the manhole cover you would have to assume he was still above ground when the bomb went off, therefore killing him.
Continuity mistake: It's astonishing that Arnold still has a gun after he jumps out of the plane since he didn't holster it before he jumped. Still he pulls it out of his holster before he shoots the plane and during the shootout in the zoo. It's also pretty strange that this weapon, a Desert Eagle .357, fits into the holster, since Arnie's first pistol (the one the young Marshal was shot with) is much smaller. Another fascinating thing about the gun is the fact it has a maximum capacity of nine bullets plus one in the chamber but Arnie fires about 15 or 16 times.
Continuity mistake: After Cullen has been picked up by the FBI agents they are sitting by a table where Cullen is explained there would be risks. There is a coffee pot on the table and a white paper cup on its right side. When it cuts the paper cup has moved to the other side of the pot.
Continuity mistake: When Lee sits down to copy the files from Cyrex, the wide shot shows the clock as 10:25, a few seconds later Lee checks her watch then looks at the clock on the wall which then changes to 10:26 but then after she is done making the second copy the clock on the wall is back to 10:25 again.
Continuity mistake: In the beginning of the movie when John Kruger goes to Lee's house with the balloons; Darryl gets shot and John and Lee leave the house, get in the van and drive away. One of the guys outside shoots at the van twice, shattering the back two windows and putting two bullet holes in the windshield. In the next shot of John and Lee through the windshield, there are no bullet holes. The shot after that when they drive away, the shattered windows are not shattered anymore - you can see the reflection of light on the windows as they drive off.
Continuity mistake: When John Kruger and the woman are discovered in the Cyrez office using the computer, John grabs her with both arms and throws her to the ground. In the next shot, with them still falling on the ground, John now magically has his gun in his hand to start shooting, which isn't possible in the time difference from the previous shot, and the fact he was holding her with two hands.
Continuity mistake: You can see twice when bad guys are shot when the tape is cut and edited. The first one is when Arnold shoots the bad guy with the shot gun when looking for the blonde girl in the house, you can see just before he hits the picture on the wall that the tape is cut and replaced with the real guy instead of the dummy that was hit by the bullet. The second is at the end at the dock when Arnold has two of those really cool guns. He shoots a vehicle full of guys coming towards him and the vehicle blows up and flies over his head, and just before the vehicle blows up, you can see the cut & edit and then the car blows up and flies through the air. Undoubtedly replaced with a toy car that was blown up!