One of the staples of The Simpsons are the opening couch gags. These range from short and simple to long and complex. The reason behind why they vary in length? To fill out the run time. Shorter episodes get longer intros, longer episodes get shorter intros.
Not all stars making cameos wanted such recognition for their talents, however. Michael Jackson appeared in the episode "Stark Raving Dad," but did not want to receive credit for it. Instead, he was listed under the pseudonym "John Jay Smith."
The show's creator also revealed his favorite episode. This was obviously a tough choice given the countless classics the early seasons provided. But when forced to choose, he selected "Bart The Daredevil" as number one on his personal top ten list.
The Simpsons is beloved for its humor and endless perfect quotes. They're even respected by South Park, which featured a Bart lookalike in an episode where they eviscerated Family Guy. The Simpsons crew loved it so much they sent flowers to South Park Studios after seeing it.
Krusty The Klown and Homer Simpson are nearly physically identical on purpose. This idea to make them alter egos was dropped as it would have become a bit too complicated. The joke was supposed to be that Bart idolized Krusty while having no respect for his father, even though they were the same person.
Remember the movie-within-a-show featuring the action hero McBain? These were short clips the characters would watch from time to time. But did you know that if you put them together, in order, they actually form a coherent movie plot?
Smithers was painted as African-American in his first appearance. When asked about it, Groening said it was a mistake, and they didn't have the money at the time to do any retakes. He was supposed to be yellow. Speaking of, Groening says they made the characters yellow so they would stand out when people are flipping through channels.
"There is an ending I’ve always had in mind, which was, I thought it would be cool if in the last episode they’re getting ready to go to a Christmas pageant, and they go to the Christmas pageant that opens up the first episode, “Simpsons Roasting on an Open Fire,” so the entire series is a loop with no end. That would be my way of concluding the run, but nobody has asked me for it yet."
However, that potential ending is possibly a long, long, long time away. Fox owns the rights to The Simpsons until the year 2082. This show has a track record of predicting the future, and it appears it may run long into it.