The film's title comes from Dickie Moltisanti's family's name which when translated from Italian to English means "many saints."
Michael Gandolfini had never watched The Sopranos (1999) prior to being cast in the role of as the young Tony Soprano.
According to director Alan Taylor, Edie Falco shot a scene as Carmela Soprano that was to be used early in the film but they decided to go in a different direction. According to Taylor, they shot a few things with other original cast members in case they wanted to use it.
Michael Gandolfini had to redo many takes as his portrayal was sometimes TOO close to his father's interpretation of the character, while his was intended to be still a young teenager and not yet the feared adult gangster.
Alessandro Nivola didn't realize that he was playing the lead role until filming had begun. He was only given portions of the script beforehand.