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According to a Hollywood Reporter news item, Mary Astor originally was to co-star with William Powell. Hollywood Reporter news items add Nancy Tribble and Millard Mitchell to the cast, but their appearance in the final film has not been confirmed. The film was shot on location at Weeki Wachee Spring, Florida. Ann Blyth wore an enormous foam rubber and latex tail for her role, and seaweed was artfully draped across her upper body, drawing comments from some critics. The Los Angeles Times review called the seaweed placement "a triumph of the Johnson office over the ichthyologists, and a rather humorous commentary on American mores in itself." Mr. Peabody and the Mermaid was performed on the Lux Radio Theatre on September 6, 1948, with William Powell and Irene Hervey recreating their original roles. The 1949 British film Miranda also featured a plot about a mermaid who comes between a man and his wife, and in 1984, the romantic comedy Splash portrayed a man who falls in love with a mermaid and chooses to live with her underwater.