Plot hole: When the two remaining American helicopters return from their incursion into Russian airspace, both land outside the operational HQ hangar. This is fine, except for the question of where the eight warheads that they recovered have gone to. Surely they would have brought them back to the base rather than just leave them on the bridge, but if they had, then shouldn't they either have them underneath one chopper when they both land? Or if the chopper carrying the warheads had offloaded somewhere else on the home airbase, why did both helicopters land at the same time outside the HQ hangar?
Factual error: In the end when our two heroes try to deactivate the atomic bomb, they manage to take away a little piece of explosive, so that the bomb will not do a nuclear explosion, only a conventional one. The problem with plutonium-bombs is that plutonium itself is extremely toxic when pulverised and dissolved into air. And an explosion would surely pulverise the bomb and all people (especially our two heroes being only some metres away) in the city would eventually die because of intoxication...
Plot hole: When she checks the mails on the AOL account: Why are all mails in English? They should be in German or Russian (Problem: they use an different alphabet, Cyrillic).
Continuity mistake: In the beginning of the film the Russian officer presses a code on the back of the train carriage to close the door - the red and green buttons are at the bottom of the panel. Slightly later on when the warheads are being stolen, he has to press the code again, this time the red and green buttons are on the top of the panel.
Continuity mistake: When Tom jumps from the helicopter, into the truck that is hanging over the bridge's edge, the rope that is attached to him remains attached until Tom and Alec start fighting. Then it disappears, and suddenly reappears when Alec wraps the rope around Tom's neck. (01:14:05)
Continuity mistake: When the hijackers are setting the nuclear bomb, they drill a device to the face of the bomb, and on the right of the screen there are wires sticking out of the little silver box. In the following shot one of the hijackers opens the little silver box and pulls the wires out again. (00:12:10)
Continuity mistake: When the Major and General are on top of the train just before they jump from one train to the other, the Major and General walk across the top and they pass one, maybe both, of the hijackers. When it cuts to another view, the hijackers are passing the Major and General again. (00:11:30)
Factual error: The IFOR forces looking through the Bosnian's house have Polish badges on them, suggesting that they are indeed Polish, but the one who speaks has a heavy Slovakian accent.
Continuity mistake: When Tom points the gun at the bomber who is at the top of the stairs, his brother comes round the corner, and in the distance he is walking and creeping up to Tom and Julia, yet in the closeup he is running and waiving a gun not creeping up. Also when the bomber starts to shoot at Tom, Tom and Julia get under a grid of some kind, and when Julia drops her walkie talkie on the floor, its position changes between shots. (01:43:10)
Factual error: Near the end of the movie, when the heroine is attempting to disable the nuclear aspect of the bomb, she spends a lot of time trying to remove one of the high explosive segments form the core, when simply cutting as many of the detonator wires as possible would seem to have accomplished the same thing. A nuclear detonation requires simultaneous detonation of all the explosive segments to cause the core to go critical. Even a small delay, caused by one or more segment not going off at precisely the right time would have resulted in only a non-nuclear explosion, which is what happened.
Continuity mistake: When the Russian Major is talking to the other lower ranking soldier just outside the train, in one particular shot the soldier is looking directly at the Major. Then in the following shot he is looking down at his feet, and lifts his head up twice to look at the Major again. (00:04:15)