In Godfather 2, remember the part where it flashes back to Vito and he hunts down and kills Don Fanucci in his apartment. Well, after he kills Fanucci and then joins his wife and the three kids on the city stoop, and then picks up his son michael and says the line "Michael, your father loves you very much". It is chronologically IMPOSSIBLE for Michael to have been alive. Because when it flashes back to Vito it says 1919-however, Michael was not born until 1920.