Eighty-year-old Edward Le Veque, who appeared as the prostitute's customer, was the last surviving member of the original Keystone Kops.
Director Michael Winner intended to include Hedy Lamarr among the huge list of guests for the movie, but she couldn't be traced.
Veteran actors Don Ameche and Cesar Romero were approached for cameo roles but were unavailable. They are still sometimes erroneously credited as having appeared in the movie.
Rory Calhoun: the fictional western star Phillip Hart. The character name references the real-life silent western movie star William S. Hart.