The video has been replaced shot for shot with the lbx laserdisc and the alternate crawl was recreated in After Effects. Also Greedo's subtitles were recreated as a subtitle track. It's similar to how the dvd remastered Phantom Re-Edit was done.
For that, the audio was from vhs, the video was a dvd rip, and the subtitles were transcribed as a seperate sub track.
In that case, though, two shots had to be replaced, as no dvd source existed for them, but a before and after vhs to dvd comparison was left to show how minimal the changes were.