Well, from Princess and the Frog I would have Ray not die.
I would have kept that in. I would have killed off Louis very early on, though. Or just have him not in the picture. And I would rewrite the whole trip through the swamp because it didn't add a lot. Basically, this whole movie needs rewriting.
Dinosaur: I would have given the dinosaurs actual personalities, so I would care about them.
Beauty and the Beast: I would give it the right colors back (yes, I went there!) and I would make Belle not look fugly in a lot of shots (when she's horribly off-model). And I would give a lot more screentime to their relationship developing and less time to filler (Gaston's bar scene etc.)
Pocahontas: make the humurous characters part of the story instead of an after-thought. They are clearly shoehorned in and it negatively affects the otherwise great movie. I wouldn't cut them out entirely, because some humor is needed sometimes, but it should've been integrated better.
The Rescuers Down Under: cut out Jake. Give Cody more character. Make MacLeach a more memorable villain. Add some substance to compliment the amazing visuals. Don't have Bernard propose to Bianca, tone down the romance.
The Little Mermaid: make sure Ariel looks as beautiful as she does in 'Part of your world' throughout the entire movie. She changes from gorgeous adult to chubby teenagers so radically at times that it gets annoying.
The Aristocats: get rid of all geese characters. Most annoying motherf*ckers ever in a Disney movie. Remove the slapstick with Edgar and the dogs and instead use that time to add to the characters of the cats.
Robin Hood: don't recycle animation from previous films that damn much!
Tarzan: do better CGI backgrounds in a lot of places to make the jungle *not* look like plastic. Do other stuff, like the water and the wood with which the parents build the treehouse, in traditional animation instead of CGI.
Treasure Planet: make it *not* look like a bad computer game.
Home on the Range: okay, this needs *so* much reworking that it's actually better to axe it completely.
Alice in Wonderland: give Alice a personality.
Sleeping Beauty: give Aurora more screentime, so we actually begin to care about what happens to her. Remove all deus ex machinas
of the good fairies when helping Philip; make the end fight actually exciting instead of one magic sword being swung into the dragon; give Aurora some lines after waking up; make Malificent more threatening by making her less incompetent (relying on bumbling buffoons to look for a kid and then only finding out they were looking for a baby after 16 years --is that woman dumb?)
Bambi: get rid of the scene where they all instantaneously fall in love with female versions of themselves, right after Bambi's mother was shot.
Fantasia: cut out the visible soundtrack and severly shorten the scene with the centaurs; severly shorten the opening with the abstract forms
Fantasia 2000: get rid of the celebrity hosts; do away with the now very dated CGI; cut out Mickey's part (we already knew that); tone down the slapstick humor in a lot of the parts; make the film longer; make it feel a whole lot more like the original.
Oliver & Company: give the bland main character a lot more personality