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The film opens with voice-over narration describing the majesty of Kentucky's thoroughbred racehorses. Later, near the middle of the film, there is a montage during which the same narrator describes racehorse training. Arthur Hunnicutt was originally cast as "Ned Otis," but according to a July 14, 1955 Daily Variety news item, he quit the production after arguments with producer-director David Butler over "the way the role of a horse trainer should be interpreted." Modern sources state that Butler originally asked Debbie Reynolds to star in Glory, but she was unavailable. As noted in contemporary reviews, the Kentucky Derby race sequence used footage from the 1955 Derby. That race was won by a horse named Swaps, who played "Glory" in the film.
As noted in contemporary sources, portions of the films were shot on location in Kentucky at Calumet Farms, which was owned by the wife of writer Gene Markey. Hollywood Reporter news items add that other scenes were shot at the Rowland V. Ranch in San Fernando, CA. Although an October 1955 Los Angeles Examiner article stated that RKO planned to release the film for the Christmas season, it did not screen until January 1956. According to an November 11, 1955 Hollywood Reporter news item, the January 11, 1956 world premiere in Lexington, KY, was sponsored by Calumet Farms and benefited the University of Kentucky Clinic for Spastic Children. Hollywood Reporter news items add Sandra Rogers, Gary Marshall, Jimmy Karath and Arthur Little, Jr., to the cast, but their appearance in the final film has not been confirmed. Modern sources add Jeffrey Sayre and Yvonne Ginest to the cast.