This was the last film director Ernst Lubitsch completed himself. He died the following year during the filming of La signora in ermellino (1948).
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.
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.
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.
Richard Haydn, C. Aubrey Smith and Queenie Leonard appeared together in Dieci piccoli indiani (1945), the previous year.