Loved it! *Spoilers*
That was a pretty clever parody. It was played somewhat straight. I loved the cartoony violence. I absolutely loved the Bart and Lisa role switch.
Krusty looks awesome/scary as Pennywise. It's hilarious that Homer, not Moe, became the bartender. (D'ohs, nice name.) And Kang and Kodos at the end pitching other plots based on Stephen King novels.
I eagerly wait Treehouse of Horror XXXIII next week.