Continuity: When McClane is lying on the conveyor, and he picks up his gun, just before the camera switches to the terrorist, you see the slider on the beretta go back into the empty position, yet when the camera changes, you hear another shot from McClane's gun!

Factual error: Firing a full clip of blank cartridges from an automatic weapon in the police station office as McClane does would deafen everyone in the room. Not one person shows the slightest effect.

Factual error: At the end when John lights the fuel with a lighter, this isn't possible with Jet A-1 which is what the Boeing 747 is fuelled with. It is very hard to light. Even if you drop a match into a bowl of jet A-1 it will not ignite. Jet A-1 has to be compressed or have the temperature raised to a minimum of 38c/100f in order to ignite (which the compressing also does) so fuel in snow would never ever ignite in the way shown.

Continuity: The dead bodies of the SWAT team move around on the escalator between shots. The best example of this is after the last SWAT guy dies, there is a body or two near the end of the escalator. They disappear or at least move much further away after McClane drops his gun on the escalator. And all this happens while the escalator is not moving.

Deliberate "mistake": When the terrorists shoot a man in the church and he falls on his back, both benches behind him topple (in the shot from the ceiling of the church). You can't see that the benches are connected and even if they were, the bench he doesn't actually touch wouldn't topple.

Continuity: John McClane and Major Grant are fighting on the wing of the aeroplane, and Major Grant's mouth gets extremely bloody. The shot switches to McClane and then back to Grant, whose mouth is still bloody. However, after the shot switches back from McClane to Grant, Grant's mouth is no longer bloody.

Factual error: The last scene shows the bad guys in their plane ready to take off - driving down the runway. Then Bruce gets from the helicopter to the plane's wing, fights with each bad guy, falls off, and the plane begins to take off - again. At no time did the plane turn to circle to another runway. It seems this runway was about 2 to 3 times as long as it should have been.

Other: In the scene where the soldier is lighting General Esperanza's cigar while Esperanza is still a prisoner in transport, the cigar is visibly already lit before the soldier's lighter brushes over the cigar.

Factual error: When the 747 explodes, fire is rushing up through the cargo hold. Esperanza - in the cockpit - looks back over his shoulder as if seeing the fire coming. Clearly he can't see the fire - since the view we are seeing is inside the cargo hold and cabin. But why is he then turning his head and looking back against the cockpit wall? And the flash we see on his face - from the explosion - that would not be there until the fire was inside the cockpit. And that would go so fast that he wouldn't have time to scream.

Audio problem: When Esperanza shoots the pilot of his plane the sound of the engine changes its pitch immediately. Why does it do that? It is not as if the pilot's foot slid off the accelerator when he died.

Factual error: Several runway numbers are mentioned in the movie. Runway 10, 15, 25 right and 25 left. Runway 25 means course 250. The opposite end would then be Runway 7 (course 70). No airport would have runways running course 70, 100 and 150 - that is way too close. And Dulles certainly does not.

Deliberate "mistake": In the fight scene at the luggage machine McClane pulls a golf club from a golf bag. But a golf bag would never be sent as luggage without being wrapped tightly up. Otherwise the clubs could fall out or be damaged on the way.

Other: In the first shot of McClane on the snowmobile his breath can be seen in the air in front of his face. But he's driving so fast that that would be impossible.

Factual error: A fax machine does not have high enough resolution to transmit a fingerprint. It would just make black spots on the paper.

Continuity: In the scene where McClain is arguing with Lorenzo in the police station. McClain shoots the gun at him with the blanks in it to make his point. Lorenzo walks over to the phone, picks it up, and says, "This is Chief Lorenzo." It has been established throughout the movie that Lorenzo holds the rank of Captain.

Factual error: The interior of the plane which is deliberately crashed by the terrorists is of a BAC 1/11. I do not know any airline in the world which would choose to send a BAC 1/11 over the Atlantic from Europe due to it only being able to carry a limited number of passengers and short range capabilities.

Audio problem: When McClane says 'damn it, I hate it when I'm right' during the crawl through the ventilation duct, it is clear that this line has been dubbed.

Factual error: When the platform falls on top of McClane and he drops his gun, I don't see how it would land more than six feet away from him. One foot at the most. Unless of course it was made of rubber.

Revealing: Obvious stunt double for the black terrorist during the fight with McClane in the baggage area.

Factual error: When McClane lights the fuel with the zippo, the flame trail is all wrong. There appears to be a thin strip of fuel which accelerates away from him. However, we have seen the Fuel spurted out in a wider less controlled manner from a wing tip that has to be at least fifteen feet up, in a wind, which would have sprayed it around further. There is no way it would light in the tight manner shown.