- Welles shot predominantly at night in order to fend off meddlesome studio suits.
- 'Hitchcock, Alfred' reportedly reworked 'Weaver, Dennis' 's quirky motel clerk character in this one for Psycho (1960).
- The nighttime filming of the long, single tracking shot opening sequence had many retakes. It took so long that the sequence used was the last chance that night; the first light of the breaking dawn is visible in the background.
- When Orson Welles discovered that his film was recut, he wrote a letter to the production house with specifics on how he would have wanted the film to be released. This memo, thought to be lost, was found to be in the possession of star Charlton Heston and was the basis for the re-edited 1998 re-release.
- Janet Leigh broke her left arm before filming commenced, but appeared nonetheless.
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