As happens so often, while watching the Epic for the umpteenth time I noticed a couple of things I never noticed before.

In the scene where Vito and Genco see Fanucci extorting the theater owner, Vito asks Genco why Fanucci bothers Italians. I find that inconsistent with a later scene where Vito asks Signor Roberto to let Signora Columbo stay. In that scene he finds out that Roberto is Calabrese and he tells Roberto that we are almost paisan. The upshot of both scenes is that Sicilians don't necessarily consider themselves Italians and especially in the 1920s.