Revealing: Right after the explosion, when Simon walks up to a detective and introduces himself as an adjuster for the bank, he asks if the detective can show him the way down. When the detective says yes he calls over an officer Murphy, who is facing the crowd. Murphy is already looking back and begins to walk to the detective before he is even called for.

Audio problem: During the heist in the Federal Reserve a lot of sounds are missing. For example, when Katya drops her bolt cutters, there is no sound as they hit the ground.

Continuity: When Samuel L Jackson is at Yankee Stadium, there is a close up shot of him and in the background you can see the water hose used by the grounds keeping crew. Moments later, when the camera is on a further shot, you can see that the hose is gone.

Visible crew/equipment: In the Taxi scene, you can see that the taxi is abnormally high, and there's a special strut rig under the front part of the car so it doesn't take a destructive beating in that whole racing scene.

Revealing: When Bruce Willis and Samuel L Jackson are climbing down the rope (or whatever it is) to get to the ship, the green Dodge falls off the bridge. If you play it at slow motion, you can actually see that the truck is tied by another rope in the back, which rips as the truck falls into the water.

Continuity: When they drive through the park and jump off the rock they land on a pile of leaves which covers the hood. Some of those leaves fall off but not all of them - in the next shot the hood is completely clean.

Continuity: When the No. 3 train is arriving at Wall Street, we see that that the head car is slowing, about to stop at the end of the platform. However, when McClane shatters the storm door window at the rear of the train to eject the bomb, we see the train is still moving at speed through a local station. This is because the train interior footage with McClane was shot on the actual subway here in New York, while the exterior shots were filmed on the set in Mount Pleasant, SC.

Factual error: The gold storage in the Federal Reserve Bank is actually below the subway tunnels. So the bad guys wouldn't be able to steal the gold the way they do in the movie.

Plot hole: Simon calls McClane from inside the subway station, close to the bank's vault. The vault is supposed to have mega layers of concrete, iron and god knows what, and the subway is several feet beneath the surface. How can Simon manage to make the cellular phone work, with no interruptions and no signal problems?

Revealing: When the bomb explodes at Bonwit Tellers at the start, we see a van fly into the air. You can see the devices that throw it upwards.

Factual error: A picky, only-a-New-Yorker-would-care point: When Bruce Willis goes down into the subway, it's supposed to be the 1/2/3 lines (West Side trains). The station filmed is actually the 8th Street stop on the N/R (Broadway) lines; it's right by NYU.

Continuity: While in the police station, a chubby guy brings the suitcase with the liquid bomb and to explain how it works he dips a stick with the liquid and throws it away to make it explode. Watch now the guy behind him covering his hears: Headset off, then he puts it on; then suddenly, in a very brief shot, when he is behind the chubby man, the headset is off again. In the next shots he has it on.

Continuity: In the scene when the truck is being pulled off of the bridge by the ship, if you look closely right before the truck plummets towards the water, there is no engine, transmission, or anything else in the engine compartment of the truck, which was left exposed after the hood fell off in an earlier wreck.

Plot hole: How would McClane know that there were bad guys in the truck (in the aquaduct) when he shot through the door? Granted he had his hunch and whatnot, and the guys really WERE German baddies, but how could McClane have been sure? What if he'd shot two innocent bystanders?

Factual error: I'm afraid John and Zeus are in for a very nasty surprise when John uses a few drops of the binary explosive to blow apart Zeus's handcuffs. We know the explosive is sensitive to shock or impact, like nitroglycerine - we see samples being detonated by being hit. So, when John detonates those few drops it will set up an adiabatic shock wave, and since the binaries have mixed at this stage that is going to set the whole lot off. It's called a sympathetic explosion. Those two tiny drops are certainly enough - they couldn't possibly cut hardened steel if they weren't, and yes, glass transmits adiabatic shock waves perfectly.

Deliberate "mistake": The German version is strange, because the English is dubbed, but the German (obviously) isn't. However, this means that when they're on the boat, and the guard shouts "nicht schießen" [don't shoot], Willis asks "was hat er gesagt?" [what did he say], and is answered "nicht schießen". Bizarre.....