powered by AFI
The opening title credit appears as follows: "W. Somerset Maugham's Trio." Opening cast credits appear in the following order: Anne Crawford, Roland Culver, Kathleen Harrison, James Hayter, Nigel Patrick, Michael Rennie, Jean Simmons, Naunton Wayne, with Felix Aylmer, Finlay Currie, Betty Ann Davies, Marjorie Fielding, Raymond Huntley, John Laurie, Mary Merrall, Andre Morell, Lana Morris, Wilfrid Hyde White, and Andrew Crawford, Henry Edwards, Shelagh Fraser, Michael Hordern, Eliot Makeham, Joan Marion, Clive Morton, Kynaston Reeves, Michael Ward.
In the film's opening scene, Maugham is shown in a library. A narrator then states the following: "Somerset Maugham once told us that he has never pretended to be anything but a storyteller. It has amused him to tell stories and he's told a great many. Now those of us who helped to make these three into a film are happy once again to pay tribute to a great writer. Here he is to introduce Trio." W. Somerset Maugham then continues: "Well, ladies and gentlemen, if you see me facing you once again in this unaccustomed role for me, you only have yourselves to blame. If you hadn't liked the four stories we told you in Quartet, we shouldn't have been encouraged to show you three more. Of course, we know it's a risk to try to repeat success, and we have to leave it to you to judge if we've been well advised or not." Each segment then opens with an introduction by Maugham, followed by a narrator reading the first lines of the story from a book. The narration is intermittently woven into the stories.
In a contemporary interview with Maugham in New York Times, Maugham stated that he expanded his original story of "The Verger" for the film, and also did some rewrites on portions of the screenplay for "Mr. Know-All" and "Sanatorium." According to news items and the Variety review, the production budget of the film was shared by the J. Arthur Rank Organization and Paramount. Contemporary articles note that the filmmakers were inspired to make Trio after the success of the 1949 British release Quartet, which was also based on W. Somerset Maugham short stories. Trio was nominated for an Academy Award for Best Sound Recording.