I finished the Season 4 set last night. Originally, the final episode, "We're Outta Here", was broadcast as a one-hour episode. The DVD presents it in it's two-part, syndication version. I don't know if anything has been cut, but the combined running time is a bit over 48 minutes, with the inclusion of a new set of opening/closing credits (but no Part 1 "recap"). A few minutes were probably cut to accommodate the added credits. The episode is indicated on the menu as "Parts 1/2", with a single icon to select, which will then play them consecutively. There's no way to access the second part directly, without first selecting Part 1, then chapter skipping to it. The break in the episode comes just past the 24:00 mark. It is detectable by a rather abrupt "freeze frame" and an awkward fade-out, then augmented laugh track (not to mention the addition of "To be continued" onscreen.)
Another episode from Season 4, "Sophia's Weddding", was originally broadcast as a two-parter. It is presented properly on DVD, complete with Betty White's "Last time on The Golden Girls..." intro to the recap.
Season 3 also had a one-hour episode, but it was presented in its original form. For some odd reason, this hour-long episode is listed on the menu as "Golden Moments-Parts 1/2", again, accessed by a single icon. However, there are not two parts to this episode on the DVD. Only the syndication version was edited into two parts.
Seasons 1 and 2 had no two-part or hour-long episodes. Seasons 5 and 6 each had a two-parter and a one-hour episode. The final season had one two-parter and three one-hour episodes.
So far, Buena Vista has been good about presenting TGG with original episodes, with the possible exception of "We're Outta Here" from Season 4. Let's hope they get the rest of the series right...not to mention surprise us with a few extras along the way.