The stop-motion animation used in creating the illusion of a dancing squirrel (Rupert) was so realistic that director George Pal received many inquiries as to where he got a squirrel that was trained to dance.
Jimmy Durante was actually a last-minute addition to the cast. As a result, Terry Moore's billing was dropped from first to second. The script was also modified to allow for Durante-style patter and songs.
It may be reasonable to assume that the writer chose "Amendola" as actor Jimmy Durante's family's last name, given the movie's subject matter. When the Amendolas felt blessed by money from what they thought was from heaven, indeed, the play on words "Amen Dollar," fits perfectly.
When this was shot in 1948, it became the first film in which Helen Koford was credited as "Terry Moore." The film was not released until 1950 at which time several other movies had been released in which she was credited as Terry Moore.