Comment: The Simpsons strikes again with another bit of Indian lore.
The homework in question is an assignment to build a model of a Hopi pueblo. You can see what happens from the 0:34 to the 1:17 mark in the video.
For a cartoon, I'd say the depictions of Hopi culture are reasonably accurate. This is a good example of how you can use Indians in humor without making them the butt of the humor. It also demonstrates that it's not necessary to use Plains stereotypes to make Indians recognizable.
For more on the subject, see 2010 Olympics in The Simpsons and Indians in The Simpsons.