This episode is the last appearance of Dick Elliott as Mayor Pike. The actor died on December 22, 1961, exactly one month prior to this airing.
This is the fifth episode of this season of which the guest star went on to star in their own series: Buddy Ebsen ("Opie's Hobo Friend") starred in The Beverly Hillbillies (1962) and Barnaby Jones (1973); Edgar Buchanan ("Aunt Bee's Brief Encounter") starred in Petticoat Junction (1963) and Cade's County (1971); Alan Hale, Jr ("The Farmer Takes A Wife") starred in Gilligan's Island (1964); Bill Bixby ("Bailey's Bad Boy") starred in My Favorite Martian (1963), The Courtship Of Eddie's Father (1969) and The Incredible Hulk (1977) and Barbara Eden (this episode, "The Manicurist") starred in I Dream Of Jeannie (1965) and Harper Valley PTA (1981).
The character named "Emma Watson" was also occasionally referred to as "Emma Brand."