The comedic lyrics Donald performs for Ann at the beginning of this episode, which he says he wrote for a college musical comedy revue, were practically identical to lyrics Rob Petrie performed (and says he wrote) in an episode of '"Dick Van Dyke Show, The' (1961)'. Not a surprising incident considering both shows shared a number of the same writers and producers.
Bill Persky, creator, producer, writer of the show, wrote the lyrics for the tunes Donald sings to Ann, i.e. "It's a Funny War" and "The Only Girl I Ever Loved." The tunes first appeared in The Dick Van Dyke Show (1961): Bupkis (1965). Bill Persky wrote for 29 episodes on that series.
Final appearance of Bonnie Scott as Judy Bessemer and the end of the Judy Bessemer character. Final line: "How do you tell the man you love you don't like his jokes?"
Donald plays the piano for the first time. In real-life, Ted Bessell was a child prodigy on the piano.