- The film was begun by Rouben Mamoulian, but Otto Preminger, who initiated the project as producer and took over the direction, brought on a new cameraman and scrapped all of Mamoulian's footage.
- The character of Waldo Lydecker appears to be based on the columnist, broadcaster, and "New Yorker" theater critic Alexander Woollcott, a famous wit who, like Waldo, was fascinated by murder. Woollcott always dined at the Algonquin Hotel, where Laura first approaches Waldo.
- Darryl F. Zanuck was opposed to casting Clifton Webb because of his known homosexuality, but Preminger prevailed and the 54-year-old Webb, making his first screen appearance since the silent era, was nominated for an Oscar.
- The portrait of Laura is, in fact, a photograph done over with oil paint.
- The original choice for the role of Laura was Jennifer Jones, who turned it down
- The film as we see it now is without its original ending. Apparently, the shooting scene at the end of the movie was originally filmed from a different angle, and an ending was scripted wherein the whole story turns out to have been nothing but a dream. However, this ending didn't work and was deleted from the final product; also, Preminger reshot the shooting scene from a different angle.
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