The last names of the characters in this episode played by Don Ameche and Anne Francis are taken from well-known mystery writers Ngaio Marsh and Raymond Chandler respectively.
Jack Kelly is best known for his role as gambler Bart Maverick on the classic 1957-62 ABC western Maverick.
Craig Stevens' best known for playing the title role in the private eye TV series Peter Gunn.
Susan Strasberg was the daughter of famed acting guru Lee Strasberg.
Anne Francis' best known TV role is the female private eye Honey West.
Evelyn Chandler is listening to Abbott and Costello on the radio at the beginning of the episode.
Jack Kelly and Anne Francis had previously co-starred together in the classic 1956 sci-fi film Forbidden Planet.
David Wayne and Ida Lupino both appeared in the Adam West Batman series in the 60s, as the Mad Hatter and Dr. Cassandra Spellcraft.
Brimmer: Nice of you to caddy for us, Queen.
Ellery: I thought these matches were fixed.
Inspector Queen: Aw, they're just setting up things for a re-match.
Inspector Queen: What makes you think it wasn't suicide?
Ellery: I didn't say it wasn't.
Inspector Queen: Velie, show the gentleman out.
Brimmer: I have some interesting information for you, Inspector.
Inspector Queen: Hold it, Velie.
Inspector Queen: (about Kendrick) There's one man who isn't very upset about his wife's suicide.
Ellery: If it was a suicide.
Brimmer: The lawyer who probates this estate will receive an enormous fee. Think about that, Queen.
Latimer: Miss Chandler and I are old friends.
Ellery: I gathered that.
Ellery: Dad, you have the most wonderful habit of asking leading questions.
Inspector Queen: And you have the most wonderful habit of not answering them.
Cathy: (about Inspector Queen) How do you put up with him?
Inspector Queen: Supposition, supposition. I want facts.
Ellery: You're having Simon Brimmer tailed?
Inspector Queen: Why not? He's doing better than we are.
Dr. Marsh: All my patients are in critical condition.
Brimmer: You're about to hear a confession from the murderer. A new first in radio history.
Technician: All the mikes functioned perfectly, sir. We got everything.
Brimmer: Break the record.