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Because some onscreen production crew credits were missing from the viewed print, credit information was completed using contemporary reviews and copyright records. The opening and closing cast credits vary slightly in order. Although Paula Byrne's opening credit reads "and introducing," she actually made her film debut in the 1954 Lippert production The Black Glove. The Way Out was shot in London and released there in 1955 under the title Dial 999. The film was based on the same source as the 1942 British production Dial 999, which was directed by Lawrence Huntington and starred John Longden and Elizabeth Kent.
Variety reported on June 8, 1955 that RKO had secured distribution rights to the film outside Great Britain. Although that article reported that the picture was based on a Charles O'Malley novel entitled The Way Out, the novel was written by Bruce Graeme. According to a June 24, 1957 Hollywood Reporter news item, Tony Owen's Todon Productions filed a $1.5 million breach of contract suit against RKO on 21 Jun, charging that the studio turned over distribution of The Way Out, Postmark for Danger and Finger of Guilt to various independent distributors without Todon's consent. The disposition of that suit has not been determined.