The Simpsons is the longest running sitcom in TV history. Their design, personalities and even their voices have changed dramatically through 25 years on the air. We just didn't notice day after day, just like we forgot about many obscure and interesting factoids. So obscure that, unless you're a truly obsessive Simpsons' fan, you won't know them.
More from Gizmodo
The Day Man
Klassy Csupo style is still my favorite. Know what else they drew?