Simpsons, The Easter Egg - Movie Up Reference

Go to the season that just got the new opening and go to the last episode. To clear it up a bit, it's the episode where they are over run with people from Ogdenville, and Maggie says her first word (second if you count the one where she says daddy). Now watch the bit where Lenny and Carl go flying into the air, once they are up there, you see a house up there floating by balloons. This is a reference to the new Disney pixar movie "UP" in which they travel around in a house suspended by balloons.