- 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.
- Dick Powell 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 MacMurray.
- The blonde wig that Barbara Stanwyck is wearing throughout the movie was the idea of Billy Wilder. A month into shooting Wilder suddenly realized how bad it looked, but by then it was too late to re-shoot the earlier scenes. To rationalize this mistake, in later interviews Wilder claimed that the bad-looking wig was intentional.
- In the first scene in which Walter first kisses Phyllis, we see a wedding ring on Walter's hand. Fred MacMurray was married and the ring was not noticed until post-production.
- Billy Wilder had a tough time getting a leading man for this film; many actors, including George Raft turned the project down. He had to persuade Fred MacMurray to accept the part.
- Billy Wilder and Raymond Chandler did not get along well while writing this film's script, a process that was apparently filled with arguments. Wilder claimed that he flaunted his womanizing ability at the time to torment the sexually-repressed Chandler.
- The victim, Mr. Dietrichson, is an oil company executive. Screenplay writer Raymond Chandler was an oil company executive before he became a writer.
- Silver dust was mixed with some subtle smoke effects to create the illusion of waning sunlight in Phyllis Dietrichson's house.
- We never learn the first name of Mr. Dietrichson.
- Various studios expressed interest in the story when it first appeared in serial form in 1935 but realized it was unfilmable within the strictures of the newly-established Production Code.
- In 2007, the American Film Institute ranked this as the #29 Greatest Movie of All Time.
- Author James M. Cain later admitted that if he had come up with some of the solutions to the plot that screenwriters Billy Wilder and Raymond Chandler did, he would have employed them in his original novel.
- The movie was based on the novel by James M. Cain, which in turn was based on the true story of Ruth Snyder, the subject of a notorious 1930s murder trial.
- Barbara Stanwyck was the first choice to play Phyllis, but she was unnerved when seeing the role was of a ruthless killer. When she expressed her concern to Billy Wilder, he asked her, "Are you a mouse or an actress?"
- On viewing the film's rushes, production head Buddy G. DeSylva remarked of Barbara Stanwyck's blonde wig, "We hired Barbara Stanwyck, and here we get George Washington"!
- In the scene where Phyllis is listening at Neff's door as he talks with Keyes, 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.
- Raymond Chandler hated the experience of writing the script with Billy Wilder so much that he actually walked out and would not return unless a list of demands was met. The studio acceded to his demands and he returned to finish the script with Wilder, even though the two detested each other.
- One of over 700 Paramount Productions, filmed between 1929 and 1949, which were sold to MCA/Universal in 1958 for television distribution, and have been owned and controlled by Universal ever since.
>>> 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: Director Billy Wilder originally filmed an ending where Keyes watches Walter Neff go to the gas chamber.
- SPOILER: A different ending was shot, with Neff being caught by the police and executed while Keyes looks on in despair. Billy Wilder decided it would be poignant and fitting for both characters if instead Neff were to die in his office with Keyes by his side as he expressed his regret.
- SPOILER: The part of Walter Neff was originally offered to George Raft. He insisted that he would only take on the role if his character turned out to be an FBI agent at the end, entrapping Barbara Stanwyck's character. As this ran completely counter to James M. Cain's original novel, he naturally didn't get the part.
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