The two dancers in the "Sing, Sing, Sing (With a Swing)" montage are The Nicholas Brothers, Harold Nicholas and Fayard Nicholas. The animators directly rotoscoped their dance from Stormy Weather (1943).
According to Ralph Bakshi, he originally wanted to end the movie with Pete playing Lynyrd Skynyrd's song "Free Bird", but the producers chose Bob Seger's song "Night Moves" instead. The song "Free Bird" plays over the ending credits.
The battle scenes during the "Sing, Sing, Sing" montage were rotoscoped from the movie Hell Is for Heroes (1962).
Rotoscoped footage of James Cagney and Jean Harlow dancing from the movie The Public Enemy (1931) is included in the ballroom dance scene when Bella is singing "Bill".
Ralph Bakshi: The piano player who tells a pregnant Bella that her song "is going to be a big hit. I think you should try it out."