Continuity mistake: When John and Lucy are having an argument at the start of the film, Lucy's hair is over her shoulder or not over her shoulder, depending on the shot. (00:04:20)
Continuity mistake: John throws Matt to the floor when Matt is first being shot at. John lays on Matt to protect him and you can see that John's legs are off to Matt's left and are lying flat on the floor. The scene cuts to a view that's from behind their feet and now John's legs are no longer flat on the floor, his lower body is turned and he is lying on his right hip. (00:11:20)
Continuity mistake: When McClane knocks the fridge over so it's on its side near the start, his head is above the top (side) of the fridge. Camera cuts and it is well below the top (side) of the fridge. (00:12:45)
Continuity mistake: When McClane tells Matt to get ready to run when in the apartment, McClane's position changes instantly. (00:14:05)
Continuity mistake: When Running to the car after the apartment shootout, Farrel gets in the car and McClane is not around by the car as we can see the car. However when Farrel shuts his door, McClane is already in the car. In the previous shot we could see McClane behind Farrel. (00:15:35)
Continuity mistake: When the one bad guy has got McClane near the start in the alleyway, there is one shot where the bad guy is facing the other way. He goes forwards feet first for one quick shot then goes backwards to hit the dumpster. (00:16:05)
Continuity mistake: When in the traffic jam, just before the first accidents, the background doesn't move in the shots of Ferral, but it does, and quite fast, in the shots of McClane. (00:22:00)
Continuity mistake: In the traffic jam in the beginning of the film (right after all the lights have changed to green), the car next to McClane's is black/dark. But a few seconds later when you see it from a helicopter, it has changed to white. (00:22:30 - 00:23:30)
Continuity mistake: During the traffic jam scene, when the truck crashes against the taxi, the view inside McClane's car shows the taxi colliding against the car, dragging it away violently. From the aerial angle, the taxi doesn't touch McClane's car at all. (00:22:35)
Continuity mistake: At the end of the scene where Bruce Willis's own car is involved with a crash between a dustcart and taxi you can see his driver's door opening during the aerial shot after he has left the location. (00:24:25)
Continuity mistake: During the traffic jam early in the movie, John and Matt get out of their car and walk away on foot. In the next aerial shot looking down, you see someone stepping out of the very same car they were in. (00:25:27)
Continuity mistake: When McClane first brings Farrell to the Cyber division, McClane has a cut over his eyebrow that he gets from a fight scene later in the film. [This mistake is pointed out in the DVD audio commentary: this scene was filmed after said fight scene was completed. Still a mistake, though.] (00:29:00)
Continuity mistake: When McClane is driving the police down the ramp to the tunnel so he can elude the helicopter, the car's windshield doesn't have any bullet holes or cracks in it, even though it did just a few seconds earlier. (00:37:55)
Continuity mistake: While McClane and Farrell are in FBI Police car 279, the windshield's rearview mirror repeatedly vanishes and reappears. (00:38:25)
Continuity mistake: When McClane and Farrell are fired upon during the escort to DHS, Agent Johnson is killed and slumps against the steering wheel, and in the next shot the deceased's foot slips off the brake so the car jolts forward and hits the FBI's SUV in front of them. Four shots later, in the interior shot from the back seat directly behind McClane ducking inside the car, we see Agent Johnson sitting upright very much alive, at the left side of the screen. (00:38:35)
Continuity mistake: When the truck crashes into the pillar that McClane and Matt are hiding behind in the tunnel, we see a large portion of the pillar fall off from the left side. However, when McClane gets up to drive the police car, the pillar is in perfect shape. (00:41:30)
Continuity mistake: When in the tunnel after blowing up the helicopter, John has got blood all over his face. However the amount of blood and the position of the blood keeps changing. (00:43:20)
Continuity mistake: In the scene when Bruce Willis is driving the police car up the ramp to blow up the helicopter, the guy jumps out. As he jumps out he has got headphones on, but when he lands on the car they fall off. The next scene it shows him taking them off. (00:43:45 - 00:44:40)
Continuity mistake: John's face is all bloody after he rolls from the car and "kills a helicopter with a car". The blood on his face constantly changes during the shots. Sometimes there is blood all over his face, sometimes there is quite a bit less. Sometimes he has blood streaming from the cut on his nose, sometimes there is nothing on his nose. The blood changes back and forth, so it's not just him wiping the blood away from his face (and his hands are by his sides during all the shots). (00:44:35 - 00:45:30)
Continuity mistake: When inside the stationary semi-truck the actors are swaying and moving as though the truck is travelling, but it has not yet left the warehouse. (00:50:00)
