Just a little thing I found. Not sure if it's too big of a deal.
Since you can't knock Dry Bones back with Star Spins, you can't really move him that much. If you keep bumping into him (and taking hits), he can be knocked into lava, where you can see him suffering a lot while sinking.
It's sad, but a nice detail, as every other enemy just blows up when hitting the lava.
"I love going on message boards and complaining about games I've never played!" - Francis, Super Paper Mario