The death of Dominic and the shots before it with the bridge.Either that or when Dominic went to give the pastry to the girl. He waits out the room and begins to eyeball it, beginning to eat it himself. I don't know why, but that scene is just so beautiful.
The puzzled looking man is in fact an old comedian, at least that's what my dad told me.
I always liked the Noodles Returns sequence with Fat Moe, Noodles thinks that Fat Moe made off with the money but finds out that he's on his ass worse than ever.