I would have put the bonus scenes where they belong as part of the move, rather than on a separate disc. I have to think that some of them were originally cut from the theater version to reduce running time or for some other studio pressures. On DVD, there are no such pressures, and many of the scenes, e.g., Vito and sons visiting Genco in the hospital, the killing of Fabrizio, are really important parts of the Corleone family story.