The original airing had an introduction which was a huge Take That! at President George H.W. Bush's comments (saying that American families should be "more like The Waltons and less like The Simpsons"). The family is sitting in front of the TV watching Bush's speech, and Bart fires back with, "Hey, we're just like The Waltons; we're praying for an end to The Depression too!"
Non-Singing Voice/Irony as She Is Cast: For legal reasons, the King of Pop could not provided his own singing voice. It was instead provided by Kipp Lennon, a sound-alike Jackson personally chose.note There's also a rumor that MJ wanted to prank his brothers into thinking Lennon was him.
What Could Have Been: A sequel was planned where Leon Kompowsky now believes he's Prince and encourages the town to be free and open with their sexual sides. The episode was dropped when they couldn't get the real Prince to do voicework, in part because he insisted on writing his own script for it and the showrunners found Prince's script too out-there for network TV.
The original plot line for Homer to be committed was that he would escort Barney to the asylum to be treated for his alcoholism but then start acting crazily upon their arrival causing the doctors to assumed he was the one to be committed.