This was the last film director Ernst Lubitsch completed himself. He died the following year during the filming of That Lady in Ermine (1948).
Richard Haydn, C. Aubrey Smith and Queenie Leonard appeared together in And Then There Were None (1945), the previous year.
Alhough in Margery Sharp's novel Adam Belinski is Polish, in the film - for which for no reason is given - he becomes Czech, yet his Polish name (Belinski) is retained.
Peter Lawford (as Andrew Carmel) drives a 1937 MG SA Tourer by Charlesworth. C. Aubrey Smith (as Col. Charles Duff Graham) is driven in a 1930 Rolls-Royce Phantom II Town Car. Near the end of the movie Charles Boyer (as Adam Belinski) is chauffeured in a 1936 Lagonda LG 45 Tourer.
Establishing footage of Friars Carmel Manor was later also used in "The Fox Hunt," a 1956 episode of "I Love Lucy," as Berkshire Manor, the home of Sir Clive Richardson, who invites the Ricardos and Mertzes for an English country house weekend.