They missed it, both characters look like each other, why? why the director had to choose De Niro for both character's we did not have enough actors??, does not make sconce, then the old Castelo not much different in age from young one, the one that tells the story almost same age as now Castello just a little bit of makeup, confusion in looking at De Niro finding who is Vito who is Frank, and no juice in movie.
And... Alto Knight?? what??, who choose the name, waste of talents, no story, no action, talk talk talk, meeting after meeting, nothing.