Andreas Winnberg

Factual error: The money counter used by the gangsters has a green seven-segment LED display. Although green LEDs had just been invented in the 1970's, they where way too dim and expensive to be used in commercial applications and especially seven-segment displays back then.

Andreas Winnberg

Factual error: If the natural gas could be rerouted to McClane's position at the national grids control center, there are two major problems. The gas would not self-ignite on its way there as pictured, and the sheer momentum of that massive amount of gas in those long pipes would cause a massive leak at the endpoint. However, after the first (relatively small considering the total energy in all the gas) explosion, everything goes back to normal without one giant amount of gas erupting.

Andreas Winnberg

Factual error: In the scene where Michael is patching the ATX motherboard with a paper clip, the sparks coming out of the box are ridiculously long for being low voltage flashovers, especially as the motherboard has no power supply connected to it. Even if the board would run directly on mains voltage the flashovers would only be a couple of millimeters. Furthermore, flashovers are blue, not yellow as shown. (00:53:55)

Andreas Winnberg