Also, this season the show's animation company switches from Klasky-Csupo to Film Roman. In many episodes this season, the characters' features a bit more sharp, their pupils sometimes look very big, and they move their arms, legs, and body around in a more bouncy, flexible, and extreme thing. For Homer, it's mostly his mouth, which opens very wide sometimes, plus, his lips also lose their proper shape when he talks sometimes. That's the best example. This season brings us the animation we know.
Homer looks solid, and the yellow of their skin is a bit brighter than last season.
The animation is sharper than last season, and the yellow of the characters' skin isn't as bright. Either way, the animation has improved. The animation looks almost identical to the even-numbered episodes of season 11 and 12. Not so great in the odd-numbered episodes.