Panelist and Get Smart (1965)'s co-star Barbara Feldon appeared in another game show 10 years earlier as a contestant (Shakespeare (1957)), under her maiden name 'Hall'.
Melina Mercouri was starring in the Broadway musical 'Illya Darling' at the Mark Hellinger Theatre. The show ran for 320 performances and 22 previews, closing on January 13, 1968. Mercouri was nominated for a Tony Award for 'Best Performance by a Leading Actress in a Musical'.