To help establish with the cast and crew the kind of tone he was trying to create, Robert Altman circulated on the set a little-known letter that Raymond Chandler had written, as well as his essay collection "Raymond Chandler Speaking". Both pieces are notable for revealing Chandler's underlying suicidal tendencies.
Some movie posters for this film described its central character of Phillip Marlowe as being "The greatest of all private eye characters - Created by Raymond Chandler".
When Marlowe buys a newspaper from a vending machine, the headline on the front page reads "Jet hijacked". Moments later, when reading the same paper in the car, the headline has switched to "Rain of jet parts".
Marlowe's initial line following Dr. Verringer's demand of $4400 from Roger Wade (in the hospital) appears to be dubbed. Marlowe lights a cigarette and does not move his mouth as the line is heard.
Dr. Verringer: I apologize for this intrusion, Mrs. Wade, but your husband dislikes paying his bills. I'm sorry; in future I must refuse to accept him as a patient.
Roger Wade aka Billy Joe Smith: I tell you what we're gonna do, Marlboro. You're gonna take that goddamn J.C. Penney tie off and we're gonna have an old fashioned man to man drinking party.