- Director Billy Wilder originally filmed an ending where Keyes watches Walter Neff go to the gas chamber.
- The character Walter Neff was originally named Walter Ness, but director/writer Billy Wilder found out that there was a man living in Beverly Hills named Walter Ness who was actually an insurance salesman. To avoid being sued for defamation of character, they changed the name.
- The scene where Neff and Dietrichson can't get their car started after the murder was added by Wilder after his car wouldn't start at the end of a shooting day.
- 'Powell, Dick' wanted the role of Walter Neff, but he was under contract to another studio and they wouldn't allow it. He was enraged and tore up his contract. The role went to Fred McMurray.
- In the scene where Phyllis is listening at Neffs's door as he talks with Keyes: As Keyes exits into the hallway and Phyllis hides behind the door, the door opens into the hallway which isn't allowed by building codes even back then, but it does give Phyllis something to hide behind and increases the tension.
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