DSC' Question :

the 3 things brando did for the role :

- he stuffed his cheeks with cotton wool for the screen test.

- during filming, he wore an appliance made by a dentist

- imitated Frank Costello's voice.

Thats what you meant?

DE NIRO'S question :

The pope was 81.

Q: when do we see Rocco for the first time?