Even though this was the next-to-last episode broadcast during the show's network run, this installment was prerecorded on July 23, 1967, just before the actual date's episode aired live (no kinescope copy, considered lost). The show's cancellation had been announced on February 14, 1967.
Hugh O'Brian had just started touring with the Broadway play 'Cactus Flower', on August 01, 1967, at the Central City Opera House in Central City, CO. O'Brian would travel with the production for a year.