This three-part episode was originally written as a script for a feature-length "Get Smart" movie for theatrical release, but Paramount decided against that in the wake of only fair box office returns for Munster, Go Home! (1966), Batman: The Movie (1966), and McHale's Navy Joins the Air Force (1965).
Kenneth Mars, who plays Tom Orlando returns in the reunion TV movie Get Smart, Again! (1989) as Cmdr. Drury, the head of the intelligence services.
John Myhers' character, Otto Hurrah, is seen driving a blue Mark 1 Sunbeam Tiger. This is a rather exclusive model British sports car with a Ford V8, based on a Sunbeam Alpine. Max drives a red one in the opening credits.
During the sword fight, the hand Max is using to hold the sword changes during the close-ups.