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Trivia: At the beginning Criswell reads, "Can your heart stand the shocking facts about 'Grave Robbers from Outer Space'?" This was the original title of the movie that was changed because of objections by the financial backers.

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Trivia: At the end of the movie Lauren Bacall says to Marlowe "Phil, there's two men out back behind some trees". This is the only time in the movie that she refers to him by his first name. (01:49:45)

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Trivia: All of the main characters in this movie have a specific tic. Marlowe is always pulling on his right ear, Lauren Bacall plays with her ring and Carmen Sternwood picks at her teeth.

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Trivia: The homage Roman Polanski pays is subtle but there are many similarities to Sam Spade in the Maltese Falcon directed by John Huston. Ida Sessions in beginning of the movie trying to put one over on Jake, the guys removing Hollis Mulwray's name from the door of the office after he dies, and Jake's interrogation of Evelyn Mulwray at 1972 Canyon Drive.

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Trivia: The blonde schoolgirl in the train dining car is Patty Boyd, who later became George Harrison's first wife and had three famous songs written about her: "Something," "Layla," and "Wonderful Tonight." The latter two were written by Eric Clapton, a friend of Harrison's, and who later became Boyd's husband after her divorce from Harrison. (00:09:35)

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Trivia: This is the very spot at the Dakota building on 72nd Street in New York City where John Lennon was murdered. (00:02:00)

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