Simpsons, The Easter Egg - Movie Pig

On the following episodes, you will see the pig from the simpsons movie.
Halloween Episode: On the episode where the kids are trick or treating, and Ned becomes the Devil, the pig that lands on Homers head is the pig from the movie.
Barts Cow: On the episode where bart joins the 4 leaf clover ranch, you can see the pig for a brief period of time.
Lisa becomes famous: In the episdode where Nelson becomes Krunty's krustiteer, (watching it right now) when it's the auditions, you can see the pig again there.
I'm pretty sure that it was on another one, and that it'll appear later on to (hidden to)