captainsolo said:

Does anyone here have the old THX DVDs for the first three films? I've come across some references that claim that while the SEs were the same and added the bonus features, that the old discs were 1.66 like their LD counterparts. Can anybody confirm this?

I have these THX DVDs. The widescreen versions are the same as the SE versions (I ripped them both with makemkv and the output was within a few bytes).

I did a comparison of the widescreen and full-frame versions of Goldfinger and noticed that the full-frame is not a simple crop, it has a little more image at the top and bottom (but the sides are cropped).

I might double-check this in the next couple of days, as it was about 2 years ago that I looked at this.