Audio problem: In the scene when Carole catches Ms. Lefavre in Michael's apartment, she (Ms. Lefavre) tries to cover by pretending to be Michael's maid. As she moves about, cleaning various items, she talks about all the work she has to do, etc., etc. However, throughout this entire sequence her mouth never moves or so much as opens.
Trivia: When all of the characters are together in Peter O'Toole's hotel room towards the end of the film, Peter Sellers exclaims that Ursula Andress is a "personal friend of James Bond!", in reference to her performance in the first Bond film, Dr. No (1962). This was an ad-lib by Sellers, and Andress visibly cracks up before the shot cuts away.
Michael James: Could you tell me about your typical clientele?
Etienne: My typical clientele?
Michael James: Typical.
Etienne: All the people who are here now are typical clientele.
Michael James: Really?
Etienne: There is a man cheating on his wife in room Lola Montez. There is a woman cheating on her two husbands in Carlotta. Two lovers of indeterminate sex in Reine Margot. And two men cheating in Don Juan.
Michael James: Yes. Well, one might say the joint is jumping.
Anna Fassbender: Is she prettier than me?
Dr. Fritz Fassbender: Is she prettier than you? I'M prettier than you.