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King Leopardi's hit song that Marlowe is listening to when the episode opens is titled, "Lady, You Know My Number."
Marlowe's license number is 137596. (Coincidentally, this is also Sam Spade's license number.)
Ed Bishop, who appears in this episode as a district attorney, played Philip Marlowe in a series of BBC Radio adaptations of the Chandler novels in the 1970s and 1980s.
In this episode, we learn that Annie Riordan (Marlowe's girl Friday from Season One) has left town.
The murdered private investigator, Arbogast, shares a name with Martin Balsam's character in Hitchock's Psycho (1960). In the film, Arbogast is also a private detective who meets an untimely end.
Angelo Rizacos appears as Frisky. He had previously appeared as the ill-fated Tony in "Guns at Cyrano's."