Tree House of Horror II: A Simpsons Halloween - S3-E7
Corrected entry: How can Moe not realize he got a prank call that's really long, and isn't even asking for a name? (00:11:35)
Corrected entry: At the start when Homer leaves with Bart, Patty and Selma have their hands in their laps. As soon as they start speaking however their arms are crossed in front of their chests. (00:01:50)
Corrected entry: When Homer goes to another bar we hear him say "Ah, my new watering hole." His mouth doesn't move. (00:17:10)
Corrected entry: When Homer goes to the barbecue, he grabs a plate of burgers. There isn't a burger at the top of the pile. However, when Flanders talks to him there is a burger on the top.
Corrected entry: At recess, Bart splits his pants in front of the girls. This split isn't visible in any other part of the episode. (00:02:35)
Correction: This episode takes place over multiple days so he could have changed his pants at the start of each day.
Brother Can You Spare Two Dimes? - S3-E24
Corrected entry: Homer wants a vibrating chair because his sofa fell apart, which his brother buys for him at the end. In the last scene, Marge is sitting on the same sofa as if it is intact.
Correction: Homer's brother could've paid for a new, resembling the old one.
Tree House of Horror II: A Simpsons Halloween - S3-E7
Corrected entry: When Homer buys the severed hand, the person selling it says "I strongly advise you not to purchase this item". Then why is he even selling it in the first place if he'd advise people not to buy it?
Correction: He may only want certain people (such as those he does not like) to buy it. He's advising Homer not to buy it as he's done no wrong in the seller's books.
Lisa's Pony - S3-E8
Corrected entry: At the beginning of the talent show, Skinner tells the audience that all the doors are locked. Homer enters the auditorium during Lisa's performance. (00:02:05 - 00:06:10)
Correction: Skinner was joking, safety requirements would not allow him to lock the doors.
Like Father, Like Klown - S3-E6
Corrected entry: When Krusty arrives at the Simpson house, the time on the clock in the background changes. (00:05:10 - 00:05:55)
Correction: That's what clocks do, even in cartoons. The changes in time make perfect sense.
Like Father, Like Klown - S3-E6
Corrected entry: The monkey doesn't have a tail. (00:05:55)
Correction: Not at all clear if this is true, the monkey may simply have its tail between its legs.
Tree House of Horror II: A Simpsons Halloween - S3-E7
Corrected entry: At Moe's tavern, the beer in everyone's glasses is very odd. In Barney's glass the liquid is shaped like a hand, and the other guy's glass is shaped like a half-oval, with foam coming out of it. (00:11:35)
Correction: Odd is permissible in the Tree House episodes. Some of the normal rules don't apply.
Like Father, Like Klown - S3-E6
Corrected entry: During this episode, Krusty is seen looking at the Simpsons videos and some Jewish magazines. Krusty can obviously understand what they are saying (as he seems eager to watch a video he finds at the Simpsons house and he gets very upset looking at a Jewish father/son magazine). However, he is supposed to be illiterate, reinforced by the fact that Krusty couldn't read Bart's letter early in the same episode.
Radio Bart - S3-E13
Corrected entry: When Bart accidentally drops the radio down the well, we can see in the first shot that the rope is in a bundle and is very long. In the next shot the rope appears to be shorter. (00:09:35)
Corrected entry: After Bart crashes at the social club, it has stopped raining. (00:05:25)
Correction: Not at all clear why the rain stopping is a mistake.
Corrected entry: When Homer does the test again, he doesn't read the questions in order if you look carefully on the sheet. (00:18:00)
Correction: There is no reason why he has to read them in order. He's answering the ones he knows first which is something many people do.
Corrected entry: Homer complains that he missed a part of Joe Theisman. It's a TAPE. He can just watch it over again. (00:07:10)
Corrected entry: After Marge finds out that Bart didn't watch Maggie, she spits her pacifier at him. In the very next shot her pacifier is back in her mouth. (00:02:25)
Correction: Almost every other show it is demonstrated that Maggie has hundreds of pacifiers available to her. She spits one out, and she gets another one. That's just what happend here.
Like Father, Like Klown - S3-E6
Corrected entry: Krusty tells the monkey to wait in the car. However, when Krusty leaves, he has no car. (00:05:55 - 00:11:30)
Correction: "Go wait in the car" is a common form of dismissal in the film/t.v. industry - it means "sod off", words to that effect. No car is involved.
Corrected entry: Why would the audience NOT notice that Nelson was given a knife by his friends? (00:13:40)
Correction: Even if they did see, why would they care? Knives aren't illegal and for all they knew, the knife could have been his to begin with.
Corrected entry: If Seymour was trapped under papers, wouldn't his mother set him free somehow? (00:19:15)
Correction: If the police couldn't find or hear him despite being in the garage then she would most likely not hear him either.
Correction: He does know that it's a prank call and that Bart is the one calling. He goes along with it because he doesn't want to make Bart mad.
I'm pretty sure that this is just an internet theory.
No, in this episode Bart has supernatural powers and the whole town lives in fear of him. He's making people do what he wants because he can.