Trivia: In addition to portraying and voicing the eponymous 7 Faces (Dr. Lao, the Abominable Snowman, Merlin, Appolonius of Tyana, The Giant Serpent, Pan, and Medusa), actor Tony Randall also appeared without makeup in a two-second cameo, as a solemn spectator in the crowd, for a total of 8 roles in the film.
Trivia: The boots Clint Eastwood wears in this film are the same ones he wore in "Rawhide".
Trivia: This was the first Carry On to cast the fabulous Babs Windsor. Also the last to feature Bernard Cribbins until the making of Columbus in 1992.
Trivia: The reconstruction of the Roman Forum at Las Matas for this film holds the record for the largest outdoor film set ever constructed. The various ancient Rome settings covered 55 acres.
Trivia: Raymond Huntley (Mr. Wedgewood) does not have a single word of dialogue in all of the three scenes he appears in.