In an uncanny foreshadowing of his role in Tim Burton's film Ed Wood (1994), in this episode Martin Landau plays a Transylvanian Count, Ladislaus Zark, in full-on Bela Lugosi mode.
In a brief scene on a trans-Atlantic airliner, there is a brief glimpse of a title card for a film, "One Spy Too Many", with production credit to Arena Productions and Metro-Goldwyn Mayer. This film was in fact a theatrical release made by editing together the two parts of "The Man From U.N.C.L.E." second season opening episode, "Alexander the Greater Affair (Parts 1 and 2)", and it was produced by Arena Productions and MGM (which were the production companies responsible for the series.
Martin Landau utters the phrase "Mr Kuryakin" 15 times in this episode