Initially, Prince refused to allow the use of his song, "Kiss", for the film. However, after seeing footage of the film, he not only changed his mind and allowed the song to be used, but also wrote an additional original song for the film to use in the closing credits.
"The Song of the Heart" is the final original song that Prince created for a movie. The song won him his only Golden Globe Award and he received a Grammy nomination for it as well.
Mumble features a faded dark spot directly under his neck in the shape of a bow tie. This was added to make Mumble's appearance more like a white tuxedo. This is both to emphasize the Fred Astaire resemblance and is also a play on "penguin suit", a slang term for a black tuxedo.