On the grain issue, I just figured the grain was part of the film, but for the LD releases, they may have added a blur to the image so that the grain was less apparent. The DVDs would have been sourced from a master prior to the addition of this blur. Of course, I'm just theorizing. I have no evidence or anything. Just kinda looks that way from my experiences with adding a gaussian blur to scans and images in Photoshop.
