On the commentary track for Saint Jack (1979), director Peter Bogdanovich said he became a huge fan of Denholm Elliott after watching this film, which was before he became a director. He cast Elliott in an important co-starring role in Noises Off... (1992), which was his last film.
Stanley Ellin's original short story was also adapted for television as an episode of Tales of the Unexpected (1979) (1979). It was the first episode of the fourth season, and starred Michael Kitchen and Jeremy Clyde.
The inscription in French on the four poster bed reads "Honi soit qui mal y pense" which roughly translated into English as "Shame on anyone who thinks badly of it".
Although it was one of the best-reviewed British films of 1964, this was, unexpectedly, a box-office failure.