i don't think anyone as mentionned this yet, and it's just a detail but i think it was wrong to add the tentacles to the sarlaac pit. for me it was much scarier to imagine the people falling in there dying by being slowly digested whilst still alive, must be an agonising and very drawn-out death with no hope of escape. now with the tentacles it just looks silly, making it more aggressive.

also, when R2 falls into the swamp: why oh why did they feel the need to change Luke's line from "you're lucky you don't taste good" to "you're lucky to get out of there"? the latter is so bland, dull, boring and OBVIOUS. of course he's lucky to get out of there, or would you prefer to rust away into mud for the rest of your existence?? the original line was a bit cheesy, granted, but it is funny. and it shows that Luke has a sense of humour.

and of course, the han shoots second, the extended musical scene at the cantina, the new song at the end of ROTJ,the silly sound effects (which are also too much ised in the prequels, i know star wars is supposed to not be entirely serious but those sounds are just too stupid...)