- To create the impression of a very large bureau in the scenes where Baxter is behind his desk, director Billy Wilder used dwarf actors and specially designed furniture.
- Wilder directed Marilyn Monroe in Seven Year Itch, The (1955) and Some Like It Hot (1959). He grew to despise her demands for star treatment and her poor work ethic, and thus included the party-girl Monroe-esque character in this film.
- The wool coat Fran wears in various scenes was actually Audrey Wilder's (wife of Billy Wilder).
- Billy Wilder also used the character name Sheldrake in Sunset Blvd. (1950).
- Billy Wilder originally thought of the idea for the film after seeing _Brief Encounter (1946)_ and wondering about the plight of a character unseen in that film. Shirley MacLaine was only given forty pages of the script because Wilder didn't want her to know how the story would turn out. She thought it was because the script wasn't finished. 'Paul Douglas' was cast as Sheldrake but died before filming began.
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