Trivia

Gary Cooper was very pleased with his performance and very disappointed that the majority of critics thought him miscast due to his age. Indeed, the film's box-office failure was largely attributed to his being considered too old to play Audrey Hepburn's lover. In April 1958 he had a full facelift and other cosmetic surgery, but the procedure was largely unsuccessful.

Frank Flannagan's date at the opera was played by an uncredited Audrey Young, wife of Billy Wilder.

The movie was a critical and commercial failure on release. Many critics felt that 55-year-old Gary Cooper was too old for the part, and ought to have turned it down, as Cary Grant had.

The Japanese newspaper article on Frank Flannagan does not mention him, but rather reads "The great newspaper king Kane dies". This is the same article from "Citizen Kane (1941)," with the name and picture of Frank Flannagan added in.

In the scene where Frank and Ariane have their first tryst, the last musician who runs into the hotel room is Billy Wilder with a hat pulled over his eyes.