Two scenes....1)Vito is lying in bed after he learns of Michael's role in the Sollozo hit, and 2) in II when Mike says "Fredo you're my brother, you don't have to apologize."....In these two scenes we see Fredo in retrospect, on one hand mourning the fact that he was too weak to save his father from the hit and the other scene in II w/ Mike he gives a look of silent frustration as Mike embarasses someone AGAIN...