All regular contestants on this episode were identical twins. The last time there was a "twins' night" was on The Trapp Family Children (from the Broadway Musical) (1960).
Dick Smothers and Tom Smothers's variety show 'The Smothers Brothers Comedy Hour (1967)' would premiere the following Sunday. The series was a major success, with content that appealed to contemporary youth viewership, such as daring political satire humor and major music acts.