Jeff,
I have not compared WS Star Wars films w/P&S Star Wars films, so I too can't comment on your observation (I am not enough of a SW Geek to really notice, anyway!).
I have seen other titles (Air Force One comes to mind) where this is very noticeble, but if memory serves, the "P&S"...
The only extra on the 2000 WS SE's is the EP2 stuff that you mentioned (before A New Hope).
The other two films have no extras other than a commercial for starwars.com.
BL