- The film is dedicated to Dan Blocker. 'Robert Altman' , who had directed many early episodes of "Bonanza" (1959) had originally cast his friend Blocker in the role of Roger Wade, but he died before filming commenced. The role subsequently was filled by Sterling Hayden.
- Screenwriter Leigh Brackett co-wrote the script for the classic Big Sleep, The (1946), also based on a Raymond Chandler novel and featuring Philip Marlowe, 27 years earlier.
- The movie's ending, different from the source novel, is usually attributed to director 'Robert Altman' . It actually appeared in Leigh Brackett's original script, written before Altman signed on. Altman liked the new ending so much that he insisted on a clause in his contract that guaranteed the ending won't be changed during production or editing.
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