They kept the side narrative in an open city. But besides the fact that america 50s has much less class than 30 years (even if there is a big job documentation), something is seriously lost in the atmosphere: going from Mafioso with class of human moods of the first mafia childish gloubiboulga in this second opus, certainly very well done but causes less than the first.
In short: the first was a work of craftsmanship, enthusiast who has something to say and show, and we went to a blockbuster videogame which puts full eyes with plenty of dough. The experience is still interesting and fun, but the soul is gone ...