- on a neon sign in the view from the apartment window.
- Story was very loosely based on the real-life murder committed by University of Chicago students Leopold and Loeb, which was also the (fictionalized) subject of Compulsion.
- The film was shot in a series of 8-minute continuous takes (the maximum amount of film that a camera could hold). Every eight minutes, the camera alternates between zooming into a dark object and making a conventional cut (to allow a projector switchover in the theatre). Most of the props were on castors and the crew had to wheel them out of the way as the camera moved around the set.
- Hitchcock's inspiration for the long takes came from a BBC Television broadcast of Rope in 1939. The producer, Dallas Bower, decided on the technique in order to keep the murder chest constantly in shot.
- Although the film lasts 80 minutes and is supposed to be in "real time", the time frame it covers is actually longer - a little more than 100 minutes. This is accomplished by speeding up the action: the formal dinner lasts only 20 minutes, the sun sets too quickly and so on. The September 2002 issue of Scientific American contains a complete analysis of this technique (and the effect it has on the viewers, who actually feel as if they watched a 100-minutes movie).
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