The first "mystery guest", Roger W. Mehle, Jr., is Aileen Mehle (Suzy Knickerbocker)'s son from her marriage to U.S. Navy Rear admiral and WWII veteran Roger William Mehle. At the time, Lieutenant Junior Grade Mehle was a U.S. Navy submarine supply officer. He surprised his mother by appearing on the show while she was on the panel.
According to production notes, this episode was prerecorded on December 18, 1966. This was the third and last time that one of the show's episode was broadcast on December 25th over its 17.5-year run, happening previously in 1955 and 1960.