That was probably just the remastering that was done. I know the VHS was remastered and all that, but the DVD was remastered digitally, and that makes a big differance.
And SilverWook, a few Disney films HAVE made it to DVD unaltered. Most of the platinum editions. The only ones in the platinum line changed were Aladdin and Little Mermaid. Of course, Beauty and the Beast and Lion King both had a song added in, but they presented the theatrtical version as well. (Although the special edition of Beauty and the Beast is clearly the superior version.)