The frequently-used onscreen Griffith Park location, Bronson Canyon and Bronson Caves, features in the climax of this episode, in which huge, fiery explosions are set off in the center, rear opening, and in the canyon itself.
Lee Meriwether, in her roles as Anna Rojak and Cinnamon Carter wearing a mask of Anna Rojak, is dubbed throughout by the actress playing Cinnamon Carter, Barbara Bain, who gives Anna a distinctly different voice. The post-synching is especially effective when the masked Cinnamon briefly drops the vocal impersonation and whispers IMF instructions into Dr. Rojak's ear in her own voice, in close-up.
As the IM Force is trying to make their escape, a close-up of the clock shows the manufacturer's name: Swihart Products, Elwood, Ind., U.S.A., a company that started after World War II and went out of business around 1970.
The hydrofoil prop was so realistic, that Hughes Aircraft asked for an investigation as it was an infringement on their own miniature prototype. Unbeknownst to the prop department, their hydrofoil design duplicated the functions of the Hughes Aircraft model. It had to be explained to them that it was a non-working prop with wires as the mode of locomotion.
It takes 8:05 to recap Part 1 and begin Part 2.