In this episode, we learn that Annie Riordan (Marlowe's girl Friday from Season One) has left town.
Marlowe: Do you belong to him, or can any man take a chance?
Jean: I don't belong to anyone, Mr. Marlowe.
Marlowe: I believe you, angel.
Marlowe: There was going to be a new boxing commissioner - the fourth in a year. He said he was going to clean up the sport. Some mugs might even believe him.
"Guns at Cyrano's" was first published by Raymond Chandler in 1936.