Al Capone and Frank Nitti were first cousins in real life unlike their portrayal in the movie. This is not true.
Anthony LaPaglia would later play Al Capone in Road To Perdition although his scenes would be deleted.
Cast members Vincent Guastaferro, Wayne Grace, John Shepherd, and Alan Blumenfeld all appeared in the Friday The 13th film series respectively. Guastaferro and Blumenfeld were both in Part 6: Jason Lives (1986), Shepherd was in Part 5: A New Beginning (1985), and Grace was in Part 4: The Final Chapter (1984).