The Digital Bits strikes again! Check out  Star Wars: The Empire Strikes Back – A Visual Guide to Changes, Fixes, and Tweaks in the Disney+ 4K Version. Compositing changes, new explosion, old bloopers, and fixes that skipped a generation are shown in pretty decent detail.

This isn't a guide to the big obvious stuff, but you'll definitely notice relocated TIE bombers, altered cropping in the Millennium Falcon cockpit, and fixed rank badges on various Imperials in scenes that were flipped.  (Of course, Boba Fett is still wrong in Return of the Jedi.)  Anyway, check this out.Future guides to changes will inevitably be posted over there soon.