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Voice-over narration by Cary Grant as "George Rose" is heard intermittently throughout the film. Room for One More was based on an autobiographical novel by Anna Maria Rose Wright of Lynwood, NJ. Wright was credited onscreen as Anna Perrott Rose. Although September 1951 Hollywood Reporter news items add Karoline Grimes, Tommy Law and Elizabeth Flournoy to the cast, their appearance in the released film has not been confirmed. Fifty-one San Fernando and Verdugo, CA, Boy Scouts were extras in the Boy Scout Court of Honor scene, according to Warner Bros. production notes. Grant and Betsy Drake were real-life spouses from 1949 to 1959.
Room for One More marked the film debut of five-year-old George "Foghorn" Winslow, who first appeared on Art Linkletter's People Are Funny television show. The child, who appeared in a number of films during the 1950s, was known for his distinctive voice. Grant reprised his role for a Lux Radio Theatre production on May 26, 1952, which co-starred Phyllis Thaxter as "Anna Rose." The film was later broadcast on television under the title The Easy Way. A television series based on the film, starring Andrew Duggan and Peggy McCay as George and Anna Rose, ran on the ABC network in 1962.