Continuity: When McClane and Farrell are fired upon during the escort to DHS, Agent Johnson is killed and slumps against the steering wheel. In the next shot he is alive, looking back through the car's rear windshield, and jolts forward with the car's impact with the car in front of them. Submitted by Cubs Fan

Deliberate "mistake": When John crashes the car against the elevator room, the cables he and the woman hold on to are clean, when they should be greasy - thus allowing for them to hold safely. Submitted by Sacha

Factual error: McClane carrys a Sig Sauer P220, which has an 8 round single stack magazine. In the first shoot scene in the apartment, he reloads twice and then fires over 12 rounds blindly around the corner.

Factual error: McClane carries a Sig P220 .45. NYPD only approves the Sig in 9mm, like the P226. You can easily tell it's a .45 due to the single stack magazine, while the 9mm uses a double stack.

Audio problem: As McClane attempts to escape from the car in the lift shaft, a henchman shoots at him. As McClane hides between the seats, he cries, "Motherf**ker!" However, McClane's lips aren't moving. ('Unrated'/'Ultimate Action Edition' version only).

Continuity: After Mai kicks McLane out the window at the power hub, there is a shot of her turning and walking away. This is obviously a reused shot of when she walked away from beating up McLane only a minute or so earlier - the most obvious sign is that her hair is perfect, and then when it cuts to her grabbing Matthew, her hair is messy again.

Continuity: In the scene after the power plant explodes and Farrell is giving his "What is the point?" speech, his hair changes several times between shots, from hanging down in front of his face to being swept to one side.

Factual error: The F-35 JSF is shown having 2 guns coming from the side of the intakes and can fire for a long time. The M61A2 Vulcan Cannon on the JSF is above the left air intake and can only fire for 4.8 seconds before it runs out of ammo.

Continuity: In the scene where the semi driven by McClane is chased by the F35, the semi hits multiple vehicles causing it to damage. The driver side headlights are smashed and the bumber and fender are almost scraping the ground. In the next shot, headlights, bumber and fender are fine.

Continuity: At the very end when McClane is talking to Farrell, he has three steri-strips over his left eye, but when he goes back to his daughter he only has two. Submitted by Joel Amos Gordon

Plot hole: The amount of data that is stored at Woodlawn is so massive, the computers need cooling towers. However, the DHS guy tells Bowman that Gabriel could load the data onto a portable hard drive. The problem with that scenario is that a hard drive of that size would be able to hold a minuscule amount of the data.

Continuity: When the terrorist holding Lucy is shot in the foot, it is very clear that Lucy is wearing sandals, but when we see her feet from under the van as she kicks the gun to her dad, she has brown boots instead.

Revealing: Airbags are made out of a super strong fabric material with heavy weaving. There's no way McClane would be able to tear it. You can see the texture difference between McClane's fake airbag and the real passenger side airbag.

Factual error: When McClane "kills" the helicopter with the police car, as shown in the film, the car runs up the toll booth like a ramp and smashes into the helicopter. However, if you look, though the slab on the side is ramp-shaped, it is about 2 feet off the ground, so realistically, the car just should have smashed into the booth rather than shoot over it.

Continuity: In one scene we see the map of the power grid of Eastern Sector shutting down. All sectors are red. A few scenes later we are in Warlock's basement. He has the same map on one of his screens, but there some sectors are red and some are green. Submitted by Jacob La Cour

Audio problem: Why does the whole city make a 'whooom' noise when the power turns off? And each block makes exactly the same sound. Submitted by Jacob La Cour

Factual error: Where the film shows the power going out on the Eastern seaboard of the US, it shows the lights going out at an airport. At the airport the tail of an aircraft with the Air New Zealand logo on it is seen. Air New Zealand does not fly to any airport on the Eastern seaboard of the USA.