The film is largely based on the 1948 Broadway play, "The Silver Whistle," rewritten as part of the Mr. Belvedere film series. The film retains the names of nearly all the characters in the play but the lead character is changed as Mr. Belvedere was not a character in the play. The lead in the play was Oliver Erwenter, a romantic hobo who wanders into the old folks' home. The characters of Erwenter and Belvedere are quite different although the plot is essentially the same.
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