During Anthony's party, Neri shows Michael photos of Fabrizzio and tells him that he runs a pizzeria in Buffalo, under the name of Fred Vincent. "He's in this country illegally...came in around 1956, sponsored by the Barzini Family."

That set me to thinking: What became of the other NY Families after Michael had their Dons whacked, and then left for Nevada? Evidently the Barzini Family was still in business, and apparently paid off a debt to Fabrizzio.