Has not been mentioned, but there are many other Godfather references in the series.
I think part of that stems from Larry David. He was really into the "Godfather" and does a great Vito Corleone impression. In fact, his impressions in general are very good, the most notable being George Steinbrenner's voice on Seinfeld.
"Get better, George, get better!"
"Two words for you, George----Hot Tub."
"I got news for you. If it wasn't for the toilet, there would be no books." --- George Costanza.
