Before moving on to World F, I'll show off a few stages I skipped over. Prepare for a gif dump!
Pineapple Shore 2: Sea City
An underwater level where you explore a city...in the sea. Not much to say about other than it's the only completely underwater level in the game. Ignore the status bar.
Pineapple Shore 3: Running From Squids
A beach level that features Bloopers! These squids move around on land and will shoot ink at you if you get too close.
Maplewood Forest 2: Pumpkin Cemetery
This level takes place in a cemetery with lots of Whimps and Boos. As the name suggests though, there are also patches of pumpkins! These can be destroyed by spin jumping or hitting them from below. They pretty much just give coins, though. Nothing terribly exiting...
A few older levels got some upgrades, too:
World 1 castle has been entirely redone--it now takes place in a more ambient ruin rather than inside a fortress.
Mostly just some cluster and HDMA differences.
Once again, ignore the status bar...
And I don't think I've ever showed off World 3's castle? So here's that...
It takes place in the ruins of an old mansion. You go through the entrance, interior, outside and even its dungeon underneath.
Hacks I'm working on:
your simplistic human mind cannot possibly comprehend the complexities of my thoughts