Another nice detail I picked up after the fourth viewing:

Scorsese is fanatical about using authentic-looking people in his backgrounds. He did it in all the gangster movies. Here you see them--exactly as you'd expect them to look--in, for example, the second Sheeran christening, the Bufalino wedding, in the house where Hoffa was killed, in the restaurant where Bruno confronts Sheeran about bombing the laundry, in the bar where he's about to meet Skinny...