One thing I did notice that kind of bugged me is that in the scene where the stormtroopers are knocking on the doors in Mos Eisely the sound of the floating patrol droid is still heard in the background.
So it's the 1997 SE LD audio.
I have to wonder, reading the OP's description, whether there isn't a bit of Chinese whispers going on. For one thing, ANH has more than 120,000 frames (that's only 83 minutes), and for another, anyone running what I assume was a batch operation with Photoshop is not a video expert.
The DVD video was created using the 1993 non-anamorphic LaserDisc version upscaled to 720p to extract a 16:9 standard definition element.
That's just bobbins.
To achieve this, the 4:3 master was rendered out frame by frame and into Photoshop where it was cropped to 16:9 and blown up to 720p. From there, the contrast of the low spatial frequencies (i.e., fine detail) was increased by 75%
Isn't fine detail the high spatial frequencies? Also, you would do this before any resizing. I certainly can't think of a good reason to scale up to 720p before scaling to anamorphic video size. And as said before, you certainly wouldn't do it by saving out every frame and running them through Photoshop.
This all sounds like someone with a small, but dangerously non-zero, amount of video knowledge has taken some wild stabs in the dark as to how this might have been achieved...
DE