Sgt. Velie doesn't appear in this episode as it's set in Hollywood.
Noah Beery took time off from playing the father of detective Jim Rockford on The Rockford Files to play an actor portraying the father of detective Ellery Queen in this episode.
Barbara Rush should be familiar to fans of Seventh Heaven for her recurring role as Ruth Camden on that show.
Don DeFore had previously starred as George Baxter on Hazel.
James Sikking would go onto play Lt. Howard Hunter on Hill Street Blues.
Interestingly enough, Vincent Price and Ellery Queen co-star David Wayne both played villains on Batman. Romero played Egghead and Wayne played the Mad Hatter.
Inspector Queen: (about his part in the movie) They're trimming me down to a walk-on.
Inspector Queen: At least they got the furniture right.
Ellery: Yeah, that's about it.
Inspector Queen: Keep your eyes open, son. This is the real Hollywood.
Pierce: (to the Queens) If you're looking for glamor I'm afraid you picked the wrong studio. This one operates on a very thin shoestring.
Inspector Queen (about Briggs) They must have had their eyes closed when they cast him. Chester Morris would have been perfect.
Ellery: Something wrong?
Pierce: I guess you've never heard of the battling Mallorys. They make Punch and Judy look like Hansel and Gretel.
Claire: (to Mallory) Goodbye, darling. And I do mean goodbye.
Raynor: I don't gamble on unknowns especially stunt men who think they can act.
Raynor (about Claire) Inspector, methinks the lady doth protest too much.
Inspector Queen: Thank you very much, Mr. Raynor, for the glimpse of Hollywood beneath the tinsel. I was happier with the tinsel.
Inspector Queen: (about his trip to Graumann's Chinese Theatre) My feet are exactly the same size as Pat O'Brien's.
Raynor: Mr. Queen, I don't have to explain anything to you. You signed away your rights. You have no control whatsoever over the material.
Inspector Queen: (to Ellery about Sonny North) He doesn't look anymore like you than the man in the moon.
Inspector Queen: Sergeant Velie!
Sgt. Harris: My name is Harris, Inspector.
Inspector Queen: Sorry, forgot where I was.
Pamela: Do you think I would murder two men just to get an Oscar-winning role in a major motion picture?
Ellery: Mrs. Mallory, may I see that script.
Claire: You're the director.