Looks like Leia’s Hoth hairstyle may have been different originally, with two long dangling plaits instead of a crown braid.

Never seen this concept art for Vader’s meditation sphere before.

Asteroid weaving.

Interesting to see that Luke’s jacket under his flight harness is detailed to be camera-ready.

Frank Oz with an early Yoda design that more resembles the Ralph McQuarrie/Joe Johnston sketches.

Yoda with legs! (The outfit was worn by Deep Roy.)

The “evil tree” became the “evil cave”.

Seems they tried using a puppet Luke head for the cave sequence and it looked obviously fake, so they went with having Mark Hamill stick his head in a diorama.

This droid is ALIVE!