Goofs for
Double Indemnity (1944) More at IMDbPro »

• Continuity: Walter Neff is unmarried, yet he wears a wedding ring throughout the movie.
  
  
• Factual errors: The door to Neff's apartment opens away from, rather than toward, the apartment. This was a violation of the Los Angeles Fire Code. (Billy Wilder knew this, but could not change the door because of the crucial scene where Phyllis is hiding behind the door in the hallway.)
  
  
• Revealing mistakes: 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.
  
  

• Anachronisms: Although set in 1938, Walter Neff makes reference to the "The Philadelphia Story", which did not debut on Broadway until 1939, and on film until 1940.
  
  
• Continuity: After Neff meets with the President of his company, he returns to his apartment and places a folder on the chair to the right of the door. When Keyes comes to the door, after Neff's brief phone conversation, the folder is nowhere to be seen.
  
  
• Anachronisms: The movie is set in 1938, but at Stanwyck's house the radio is playing "Tangerine" which wasn't written until 1942.
  
  
• Revealing mistakes: When Phyllis prepares to meet Neff for the last time, the effect of "moonlight" through the blinds appears in the room just before she turns out the lamps.
  
  
• Continuity: Early in the film, as Phyllis finds Walter's address in the phone book and goes to his apartment, Neff turns on a three-way lamp by the door using a switch on the wall. Later in the film, the lamp is gone.
  
  
• Continuity: When Keyes approaches to speak to Neff as Neff enters work one morning, Neff asks Keyes if it has to do with the "Peterson" case. The name of the character in question is "Dietrichson," not "Peterson."
  
  
• Errors made by characters (possibly deliberate errors by the filmmakers): When Neff and Phyllis place Dietrichson (and his crutches) on the train tracks, Neff neglects to wipe them down to remove his fingerprints. The police investigating the case would undoubtedly take fingerprints from the crutches, and Neff would have some explaining to do if his were found.
  
  

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