The funniest discussion of the Simpsons episode guest starring various cartoonists is at the Comics Journal board, natch including this from Jennifer Gonzalez:
[W]e learn that Lisa is a big fan of Ghost World. I wonder if her teacher has given her Eightball #22 yet.
MEANWHILE, Matt Selman who wrote the episode, blogs about it at TIME:
But — OBJECTIVELY — this show is great. There are references in the first act of this thing you never thought you’d see on Adult Swim at three in the morning, let alone on Fox during prime time. Here’s a taste of what you’ll get: the guest voices are Art Spiegelman, Alan Moore, and Dan Clowes. DAN CLOWES? On network TV??? How the Hell did we pull that off? Fox doesn’t want Alan Moore, they want Mandy Moore.
Jacob Covey has the best photoshop job, but we’ll send you over to Flog to see it.