Just because it's a vent in the original footage doesn't mean it can't be a light source now (I think it improves things greatly) as does adding weight to Luke's cowl.

Nice to see Threepio with his full headlamps on too (were they trying to save on electricity with him or something in Jedi his eyes are either really dim or orange).

I wish something could be done to make Vader less glossy when he arrives at the Death Star at the beginning (it doesn't match the rest of the footage in this film or the general look in the others).