4. I would think it has something to do with earthbending, and having a deeper connection to the earth. And with earthbending, a lot of their stances tend to require them being firmly rooted (haha) to the ground seeing as the earth is their medium.

I think all the Earthbenders we've seen tend to run around barefoot.

23. Hehe. Yeah, I think so. Made in the Earth Kingdom/Never give up is forilla. XD