More excellent observations, Buscetta! Keep 'em coming.

As for Anthony being somewhat involved in Vito's and Fredo's deaths: this raises a credibility point:

Anthony was about to go fishing with Fredo and Neri when Connie told him he had to go to Reno with his father. We hear the lethal shot clearly in the last scene before the flashback, indicating that the murder happened close enough to shore to be within Michael's hearing, So, Michael either didn't go to Reno, or had returned. Either way, Anthony could have heard the shot, too. I think it was directorial license: Neri would have wanted to be as far from Michael's estate as possible so he could dump Fredo's body and be reasonably sure it wouldn't be found--way out of earshot.

Near the beginning of III, Connie tells Michael at his party: "Tony knows you had Fredo killed." I think she must have told him.

I don't recall an intermission when I saw II in first release at the theater. Nor do I recall an intermission on my VHS copy.