Not any really hilarious lines or scenes in The Godfather, compared to say a movie like Goodfellas...
but humorous lines are plenty...
I always chuckle at Clemenza riding in the car with Paulie...
"Exterminate? aww, thats a bad word to use...Lucky we don't exterminate you."
Castellano's delivery is great...always laugh at "Awww, Paulie won't see him no more."