I will nitpick just two more details.

1. Paulie could not be 10 years old in 1935. In the original novel he is described as being 26 years old in 1945.

2. Connie could not be 6 years old in 1934, at least regarding the movie timeline as that would be physically impossible. When Vito and his family return to Sicily, Michael is a toddler of about three years old and Connie is a baby. So that means that Connie was born in 1922/1923, maybe 1924 at the latest. I think Ed Falco based this on the official timeline which states that Connie was born in 1927. I doubt this timeline was constructed by FFC.

I understand this will probably be annoying, but I really can't help mentioning it. I've just finished the story and will post my opinion later on.