- Director Cameo: [Alfred Hitchcock] turning to look at Eve in her disguise as Charlotte's maid.
- Marlene Dietrich demanded to be costumed exclusively by fashion design house Dior. Dior demanded a screen credit and Paramount demanded and received a 25% discount.
- Alfie Bass 's character is called The Electrician in production papers and on Bass's contract.
- Most of Irene Handl 's performance as Miss Mason, the maid, was removed in post production editing.
- Miles Malleson was also working on Golden Salamander (1950) at the same time.
- It was Playwright James Bridie who suggested that Alfred Hitchcock cast Alastair Sim. James Bridie also contributed additional dialogue on the script of this film.
- First cinema film of Lionel Jeffries.
- The scenes where Jane Wyman first enters Marlene Dietrich's home undercover she introduces her self as Doris Tynsdale, but Dietrich refers to her first as Phyliss, then Elsie, then Doris, then lastly Mavis. It was classic dialogue play for Hitchcock.
>>> WARNING: Here Be Spoilers <<<
Trivia items below here contain information that may give away important plot points. You may not want to read any further if you've not already seen this title.
- SPOILER: This movie is significant because it broke a long-established cinematic convention that flashbacks were always a true account of earlier events. In this film, though, the opening flashback turns out to be a lie, a device which at first baffled then enraged cinemagoers who felt that they had in some way been cheated.
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