Would that be possible, Rob? By that I mean are the undesirable scenes cleanly inserted so that you could remove them without disturbing the movie? I guess it would depend on whether the new scene is a complete modern fabrication or if it's modern CGI pasted on over 1977 footage. Do actors' lines from '77 overlap with new modern scenes?
Wouldn't you need some $eriou$ hardware to edit the DVD and make it back into a DVD without running into copy protection schemes, re-compression and all that jazz? Hmmm... I've never done any video editing myself (mighty daunting prospect for the reasons just given) but I thought that it was rather tricky to extract the digital bits off a DVD. Maybe I am mistaken.