Factual error: In several scenes where someone is shot with an EM gun it nails them to the wall, but if someone was shot with a bullet that was going near the speed of light it would go right though them. And the person wouldn't move at all, they would just fall down.
Factual error: When the glass shutters come down in the Cyrez building, both he and James Caans' character start shooting at the glass. Bullet proof or not, you would be able to see marks on the glass. (01:24:00)
Factual error: When the bad guys are looking through walls with the rail gun's scope the light on the gun shines through the wall, but in real life it doesn't do that unless you are looking through a window. (00:27:15)
Factual error: When the Feds are going to the log cabin, while they are outside, gearing up, Arnold casually attaches a silencer, and pulls back the slide of his pistol, but the slide stays in the rearward position, a condition which should only occur when an empty magazine is in the weapon. Arnold notices and tries to push it forward, this doesn't work so Arnold hides it with his hand for the remainder of the scene. (00:42:50)
Factual error: After removing the first parachute, Arnold uses the emergency one. However, when he deploys it, he is only a few hundred feet off of the ground. At this height, the parachute would do nothing except possibly snap Arnold's spine. (00:57:10)
Factual error: In the train wreck scene at the end of the film, we hear the railroad warning bell clanging, the train horn blaring, James Caan and friends screaming, the fiery roar of the impact, and the rumble of the train plowing through the wreckage. In reality, all of these sound effects would have been drowned out for the duration of the scene by the ear-splitting, squealing screech of powerful railroad brakes that the engineer would have applied long before an unavoidable impact. Omitting the sound of railroad brakes is still a common factual error in modern train-collision sequences.
Factual error: All the containers have sheet metal covering the bottom, not visible bottom crossbeams as they should.