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The working title of this film was Moonlight and Roses. According to a May 1944 Hollywood Reporter news item, Jane Withers was originally set to star in the film, which was to be produced by Lester Sharpe. Swingin' on a Rainbow marked the last screen appearance of comedian and popular silent-film star Harry Langdon, who died on December 22, 1944. Although not acknowledged in the film's credits or reviews, the picture was a remake of the 1937 Republic film Rhythm in the Clouds, which featured a screenplay by Olive Cooper, starred Patricia Ellis and Warren Hull and was directed by John H. Auer (see AFI Catalog of Feature Films, 1931-40; F3.3717).