- The first film featuring a "theremin" on the soundtrack - a musical instrument which produces a strange "wailing" sound that later became familiar to 1950s science-fiction film audiences. Miklos Rozsa used it in composing the score for the nightmare sequences.
- The outdoor filming was done in New York City and the interiors were done in Hollywood. The latter included an exact duplicate of a Third Avenue bar, P.J. Clarke's on Stage 5 at Paramount Pictures, complete down to the dusty stuffed cat on the top of the payphone. Ray Milland, who stared in the film, tells that for one week every afternoon at five o'clock the door of the set would open, a man would walk up to the bar (whether filming was going on or not), order a straight bourbon, chat about the weather, plunk down fifty cents, and stroll out. It was the writer Robert Benchley, who was homesick for New York.
- Billy Wilder claimed the liquor industry offered Paramount $5 million to not release the film; he also suggested that he would have accepted, had they offered it to him.
- Cary Grant and 'Jose Ferrer' were candidates for the lead role. '
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