"Part II" was all about losing family in the changing times. The flashback scene at the end was a bittersweet reminder of "simpler", happier times when the family was together and it afforded Mike a look back on his life and an opportunity to ponder how much his life had changed. (The original script called for Don Vito to be present, telling Mike that "your country isn't your blood", but since Brando couldn't come to terms with the producers, the line was given to Sonny).