Corrected entry: The location of Evergreen Terrace and the Simpson home changes dramatically. In 'Homer the Great' the power plant car park runs past the Simpson's backyard while in the rest of the series its in the middle of a housing estate. In 'two bad neighbours' and other episodes there is a row of houses opposite the Simpsons, while in some episodes the Simpson's house is visible without opposite houses.
Corrected entry: In some episodes where they show Marge as a teenager, she has long hair thats down and straight. In others, she has her hair the way it is currently, straight up.
Corrected entry: This is not for a particular episode, but it happens in many episodes. Sometimes, people will enter the living room (where the TV is), from sides which don't actually have doors.
Correction: Not so, there are doors on all three sides of the room (not including the 'TV Wall'). Assuming the position of the TV, there is a door on the wall in front of you, into the kitchen, an archway that leads into the entrance hall and one to the left. A little used but obvious door to the garden.
Corrected entry: At the beginning of each episode Homer is working at the power plant when some radioactive material becomes lodged on his back. Later, when he is driving home, the material is on his shirt even though he was wearing a protective suit when the material became lodged.
Correction: The radioactive bar doesn't stick to the outside of his suit, it goes down inside his collar. When he's in the car, he finally figures out that something's in his shirt and pulls it out.
Corrected entry: Milhouse actually has two 10th birthday parties, the one that Bart was not invited because Milhouse's mom said he was a bad influence, and the one where he is bragging to Bart about how his dad got Krusty the Klown (which really was Homer) to his party.
Corrected entry: This is for the Season 17 episode 'Marge's Son Poisoning'. Principal Skinner says that he and his mother have been doing karaoke together since he was in the 4th grade, but in the Season 9 episode 'The Principal and the Pauper', it was revealed that the 'Seymour Skinner' we know is an impostor, a man who assumed his army sergeant's identity after he was killed in combat.
Correction: Skinner (or Armin Tamzarian, if you want to be totally truthful) has been telling lots of stories about his childhood with Mrs. Skinner. It doesn't mean that the stories are true, but he tells them to gain credibility for his role as Seymour Skinner.
True. Even in the episode "The Principal and the Pauper", the judge told everyone to forget anything happened.
Correction: Whenever something like this happens it's usually done intentionally for comedic effect, such as Homer having to park so far away from work that it's right by his house. It's not like the writers and animators forgot what is around the Simpson's house.