Edith Head, one of Hollywood's greatest costume designers, was a long-time friend of Anne Baxter. Grady Hunt did the costumes and wardrobe here, but Head makes a guest appearance. Head's designer office is shown during the episode. On the desk are displayed her real seven Academy awards. She had yet to win her eighth and final award, for "The Sting (1973)." She finished her career as the most nominated woman (35 nominations) and also the most honored woman with her eight Oscars, all for Costume Design.
In this episode, we learn that Columbo has been living in Los Angeles for "over fourteen years."
Jerry Parks's office wall features photographs of Clark Gable, Jean Harlow, Lionel Barrymore, Rudolph Valentino, Sammy Davis Jr., Carole Lombard, Leo Carillo, Gary Cooper, W.C. Fields, and Carmen Miranda. Of these, Davis was the only one who was still alive when this episode was made.
The studio rear projection cut-away car used here is a Lincoln Continental MK111, originally made for the Dean Martin Matt Helm film "The Wrecking Crew (1968)." A complete car is driven by agent Matt Helm (Martin) in that film and the rear projection cut-away version has matching gold paint & brown top with red & brown interior.
Anne Baxter (Zelda the Great (1966)) and Roddy McDowall (Short Fuse (1972) murderer/The Bookworm Turns (1966)) are the only two actors to be arrested by both Columbo and Batman.