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The Trap was co-produced by Richard Widmark's Heath Productions and Melvin Frank and Norman Panama's Parkwood Enterprises. On August 11, 1958, Hollywood Reporter stated that Lee J. Cobb co-produced The Trap, but no other source lists Cobb as a producer. According to a March 1958 Hollywood Reporter news item, the role of "Ralph Anderson" was originally offered to William Holden, after which Alan Ladd was considered. The film was shot mainly on location in the Southern California desert, according to Hollywood Reporter news items.
A Hollywood Reporter news item adds Sid Melton to the cast, but he did not appear in the final film. The CBCS lists Tony Regan as "Douglas Regan." Although a Hollywood Reporter news item in July 1958 stated that Jimmy Van Heusen and Sammy Cahn might write a title song for Earl Holliman to sing, no such song is heard in the film. Modern sources add Roger Creed and Russell Sanders to the crew as stuntmen. On July 22, 1958, Hollywood Reporter reported that United Artists protested the use of the title The Trap as being too close to the title of their film, The Rabbit Trap.