@Venkman... I didn't realise they did that, edit them I mean, but I think you may have a point. There was one movie out, I think it was Hawaii, where there was supposed to be a lesbian scene with Felecia. The VHS version I saw Felecia wasn't in it, but she was in the credits. Odd. Anyone shed some light? Rump.
Vivid would frequently edit substantive movie content for whatever reason on reissued titles (DVD or VHS). Although they seem to have stopped this maddening procedure on recent releases, there are still changes made to to their original material, like with the music score or a line of dialogue or two.
Please check this site for more details:
http://www.raincoatreviews.com/problemdvds.shtml
Also, do a search on this same subject, of which there should be a few past threads, on Adult DVD Talk.
I'm not positive, but pretty sure that all of those Vivid DVDs have been edited. I don't think Chasing the Fifties is, since I haven't heard of Wicked doing this to any of their movies. The easiest way to tell is to check the movie's specs at somewhere like Empire, who does a great job of listing the actual running time rather than what's shown on the box, and compare that running time for what's listed over at the IAFD.