Corrected entry: When Bart first writes 'Treasure Island' on the board he has written it on two lines, the 'Treasure' is above the 'Island'. But after a couple of shots we see the blackboard again and the two words are next to each other.
Correction: The word "Treasure" is written above "Island" in all shots of the blackboard.
Corrected entry: When Willy is knocked out by the falling letters, there are 3 Ns that fall sideways next to his head, making it appear as if he was sleeping. There are only 2 Ns in "Springfield Elementary School."
Correction: If you look closer at the N nearest Willie's head, it is actually the "M" from "Elementary" with a piece missing.
Correction: It disappears as Bart swings round the lamppost. There is nothing to say he didn't hit it with his skateboard, which would send it flying in another direction, thus making it seem like it has vanished.
Corrected entry: For season 1, in the introduction Lisa narrowly misses Homer on her bike, then lets it roll into the garage. If you look closely, you can see the bike disappear before the screen moves.
Correction: The bike doesn't disappear - it rolls to the left hand side of the garage out of sight.
Corrected entry: When Carl and Lenny are talking about the brain switching ceremony in Moe's Bar they speak with each others voices. For this to happen they would have to have switched vocal chords too.
Correction: This is speculation at best, not a mistake, since there's never been a brain switch to prove this. Plus, the vocal chord is controlled by muscles to change speech, and the muscles are controlled by the brain. This is why people can impersonate other people's voice (or at least change their own voice).
Corrected entry: In this episode, King Henry VIII executed five of his six wives. In real life, Henry only executed two, Anne Boleyn (his second wife)and Katherine Howard (his fifth wife).
Correction: The premise of this episode is that without books in the library, Marge is telling the kids the history stories. Marge either was just taught incorrectly or she doesn't know and made up a number that sounded reasonable.
Correction: The premise of this episode is that without books in the library, Marge tells the kids the history stories from her own recollection. Either Marge didn't know better or changed it, because a beheading makes a better story than just having complications.
Correction: Pinchy is a darkish, almost brown color, and only bright red when cooked (of course the Simpsons also depict people as being yellow).
Corrected entry: Lisa is singing "One (Is the Loneliest Number)" and looks up the composer to find out that he "died of a heart attack suffered on Valentine's Day." Although Harry Nilsson DID suffer a massive heart attack on 14 Feb 1993, he didn't die of heart disease until 15 Jan 1994.
Correction: Lisa's search said 'Harry Nilsson - Died of massive heart attack SUFFERED on Valentine's Day'. The operative word here is 'suffered'; so what that means is Nilsson died (eventually) of a heart attack that began on the 14th of February the year before. It's tricky semantics, yes but it's correct. It would've been a mistake if he'd said 'died of massive heart attack on Valentine's Day'.
Corrected entry: When Homer and Marge find Mrs. Bellamy's body, the body is shown to be neatly placed on the ground with Bellamy lying on her back. Homer then lifts up the body and it is shown that there is a pair of scissors stuck in her back. If scissors were stabbed in her back, then this means it wouldn't be possible for the body to be neatly placed on the floor lying on her back, as the scissors would cause the body to push upwards.
Correction: Since the murder was revealed as a hoax at the end of the episode, the scissors were probably fake as well.
Correction: After multiple viewings, I think his eyebrows go under his glasses, but just give the illusion of his eyebrows going over his glasses.
Correction: Bart has been 10 since the first episode. Since the Simpsons don't age, every birthday of Bart's is his 10th birthday. Homer is the only one that seems to age.
Correction: This is a question, not a mistake. Perhaps Marge was using it or it could have been in the shop. Or maybe Homer was simply too stupid to realize another car was available to him.
Corrected entry: When Smithers realises that he shot Jasper, instead of Mr. Burns, he mentions that he left the meeting early in order to watch Pardon My Zinger. However, in the previous episode, you see him walk out of the meeting with everyone else, very slowly.
Correction: True, however, everyone stopped walking after exiting the meeting and Smithers continued to walk, so he did leave before anyone else did. He said he left the meeting early probably because he was delirious and couldn't remember it correctly.
Correction: They weren't actually in Springfield when they ripped it down. The Sunblocker was obviously out of town as shown where the scene where they go to rip it down starts.
Correction: I've just checked this scene, and none of the heads appear to be floating. You can't see below a lot of them, but they're not floating.