Deliberate mistake: For Hans Gruber's iconic death scene, Alan Rickman's fall was filmed at high speed (for slow-motion playback) against a green screen, and the skyscraper perspective footage was added later as background. However, while Rickman falls away from the camera in slow motion, papers are fluttering around him in the background at normal speed. This was done deliberately to make the shot even more surreal.
Continuity mistake: When the terrorists launch the rocket at the RV, they break the same window of the building twice. (01:11:55)
Question: Why didn't Hans Gruber simply place 5 hostages in a room and threaten to blow their brains out if John McClane doesn't hand himself in? John McClane is the good guy with a conscience and Hans Gruber is the ruthless killer that kills 2 people in a heartbeat, John would have been forced to hand himself in or be responsible for their deaths. Even if Hans didn't want to kill anyone, he could have pretended to shoot people one by one. John wouldn't know any better.
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