During the flashback sequences both Tony Randall and Jack Klugman., while playing their respective fathers, are shown without their hairpieces.
Adam Klugman, who played young Oscar in the closing flashback scene, is the real-life son of Jack Klugman.
When this episode first aired Brett Sommers (Klugman) announced "Adam's going to be on Odd Couple again!", on that day's episode of Match Game '74.
The "actor" who is playing the role of the big boss in this episode is a world famous professional operatic bass singer in real life.
Dr. Unger is seeing a patient he calls "Mr. Belson" out the door, just before he meets Blinky Madison. Jerry Belson was a writer and executive producer on The Odd Couple.