The practice of trying members of the British gentry before their peers was put to a stop in 1946, six years after this movie was made.
Producer Victor Saville directed exterior scenes in London, some of which were incorporated into the final print.
In a 1991 interview, Robert Montgomery's daughter Elizabeth Montgomery stated that this was her favorite of her father's films.
This film's television premiere took place in Chicago Monday 11 March 1957 on WBBM (Channel 2), followed by Minneapolis 21 April 1957 on KMGM (Channel 9), by Seattle 30 April 1957 on KING (Channel 5), by Miami 17 May 1957 on WCKT (Channel 7), by Portland OR 25 May 1957 on KGW (Channel 8), by Honolulu 5 July 1957 on KHVH (Channel 13), by Norfolk VA 9 July 1957 on WTAR (Channel 3), by Los Angeles 11 July 1957 on KTTV (Channel 11), by Philadelphia 22 July 1957 on WFIL (Channel 6), by New Haven CT 5 August 1957 on WNHC (Channel 8), by New York City 6 January 1958 on WCBS (Channel 2), by San Francisco 13 February 1958 on KGO (Channel 7), and by Altoona PA 7 March 1958 on WFBG (Channell 10).
According to articles in the contemporary press, David O. Selznick owned the film rights to the novel and planned to have Edward G. Robinson as the lead. The Hollywood Reporter noted that MGM bought the rights from Selznick in 1938 as a vehicle for Spencer Tracy. But Motion Picture Daily correctly stated the studio bought it for Robert Montgomery to star, and shooting was planned for MGM's studio in Denham, England. This plan was nixed when WWII broke out in September 1939, and the Denham studio was temporarily closed. MGM then moved the production to the USA.