Alfred Hitchcock began to use the "Ten Minute Take" of continuous one-reel shooting which he had enjoyed refining on his previous film Rope (1948), but as the process proved far more difficult here than in the enclosed apartment-set drama, only a couple of sequences were ultimately shot for the finished print.
In his autobiography "Vanity Will Get You Somewhere", actor Joseph Cotten referred to this film as "Under Corny Crap". Supposedly he had also done so on set, invoking Hitchcock's ire; intentionally or otherwise, the director did not use him again for six years.
According to Michael Wilding's autobiography "The Wilding Way", on one occasion while Ingrid Bergman and Michael Wilding were in the middle of a passionate love scene Hitchcock let out a howl of pain, then in the most gentle tone said "Please move the camera a little to the right. You have just run over my foot." The X-ray revealed later that the camera's weight had broken Hitchcock's big toe.
Alfred Hitchcock intended this film to be a drama. However, the publicity department released the posters of this film as if it belonged in the mystery and horror films. One of the posters of this film read "Murder will Out" and "A Woman driven by the demons of hell!" When the film was released, Hitchcock was severely criticized for the lack of thrilling moments in this film compared to his previous films.
Margaret Leighton appeared with her future husband Michael Wilding in this film. After their marriage in 1964, they worked together several more times, but, by his own admission, Wilding preferred retirement and was happy just to be a supportive audience member for his wife. In this film, Michael Wilding played Charles Adare and Margaret Leighton played Milly.
The trivia item below may give away important plot points.
With Alfred Hitchcock, Playwright James Bridie wrote the screenplay for this film in such a way where four main characters (Lady Henrietta, Milly, Charles Adare, and Samson Flusky) are alike through their actions.