The fim has 3 actors who have starred as Holmes and Watson. Nicol Williamson was Holmes in The Seven Percent solution, Douglas Wilmer was Holmes in the 1960's BBC version and also in The Adventure of Sherlock Holmes Smarter Brother. Finally Edward Hardwicke played Watson in Granada' s Sherlock Holmes series replacing David Burke.
Ann Bell who plays Nicol Williamson'wife in the film played Mary Morstan in a Peter Cushing adaption of The Sign of Four, continuing the Sherlock Holmes connections in this movie
Uncredited old-fella Keith Marsh best known as TV's barfly Jacko ("I'll have a half . . . !") appears in club-crowd scene at about 30mins.
Sarah Harter's debut.