James Mason reportedly had very little patience with Arlene Dahl's "movie star" preening. Their relationship off-screen was very much like their relationship on- screen.
Pat Boone didn't want to make this film, but his agent talked him into it. Years later, he said he's glad he did it because of the regular residual checks, and it's the movie he'll probably be best remembered for.
(at around 1h 35 mins) Count Saknussemm says: "I don't sleep. I hate those little slices of death." This is a variation of an Edgar Allan Poe quote: "Sleep, those little slices of death; Oh how I loathe them".
Gertrude the duck won a PATSY Award.