Director Samuel Gallu, who once sang tenor for Arturo Toscanini, and Sir Christopher Lee hurled snatches of arias at each other between takes.
The painting above Philippe Darvas' (Sir Christopher Lee's) fireplace is The Newborn (1645) by Georges de la Tour.
The headquarters of this film's American distributor, Hemisphere Pictures, is now the home of Actors' Equity Association, the
labor union representing American actors and stage managers in the theater.
Fraser Kerr voiced Saruman in Ralph Bakshi's The Lord of the Rings. Christopher Lee played the part in Peter Jackson's Middle-Earth films.