my favourite scene is at the end of GF II -the flashback scene with Sonny introducing Carlo to the family. It shows how the family interacted with one another, how Sonny seemed to be in control of the family- like introducing his friend Carlo to his sister, suggesting that they "get together", and when he got angry with Michael and with Fredo for shaking hands, it really shows the kind of "pecking order" in the family early on.