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The working title of this film was Delayed Action. Credits on the viewed print differ from those in the cutting continuity, which was deposited with the copyright records on November 23, 1950. On the viewed print, Crystal Productions, Inc. is listed as copyright claimant, while in the Copyright Catalog and the cutting continuity, RKO Radio Pictures, Inc. is listed as claimant. The viewed print includes character names in the cast and credits for wardrobe, script supervisor and props. Makeup artist Ted Larsen's name was misspelled as Frank Larson in the cutting continuity, but was correctly spelled on the viewed print. Actor Lewis Martin's name, however, was correctly spelled in the cutting continuity, but was misspelled as "Louis" in the viewed print. On the viewed print, Joan Dixon's credit includes the adjoinder, "Courtesy RKO Radio Pictures, Inc," while composer Irving Gertz's credit is expanded to read "Music written and directed by." Voice-over narration opens and closes the film.
According to the Screen Achievements Bulletin, RKO purchased an original screenplay by George W. George and George F. Slavin, who stipulated in their contracts that their onscreen story credit read, "from a screenplay by." Although Hollywood Reporter lists Kippee Valez in the cast, her participation in the final film has not been confirmed. A July 27, 1950 Hollywood Reporter news item announced that additional scenes featuring Lewis Martin were to be shot. No confirmation that those scenes were ever filmed has been found, however. Modern sources note that RKO bought Experiment Alcatraz from Crystal Productions for $100,000.