List of inconsistent continuities

This is a list of all the continuities in the series that have been broken

Continuities Regarding Characters
this section is for character back-story events that conflict with other events mentioned in previous episodes.

Simpson Family

 * In Much Apu About Nothing, as Lisa mentions that the Simpson family were original immigrants, Abe recalls how his family original lived in the unnamed "Old Country" and eventually moved into the Statue of Liberty.
 * In Angry Dad - The Movie, Bart mentions that he watch the early episodes of SpongeBob SquarePants as a toddler, a show that debuted 10 years after the debut of the Simpsons series.

Flanders Family

 * In Lisa's First Word, Ned and Maude first introduce themselves to the Simpsons when they move to Evergreen Terrace.
 * In Lisa the Vegetarian and The Bob Next Door, it is shown that Ned's other relatives use the same nonsensical talk as he does.
 * In Hurricane Neddy, it is revealed that Ned's parents sent him to see Dr. Foster 30 years ago for anger treatment. It is also revealed that treatment also resulted in his trademark nonsensical jabbering.
 * In Viva Ned Flanders, Ned Flanders reveals that he is 60 years old.
 * In Dangerous Curves, Homer and Marge in their dating years first meet Ned and Maude, who just got married. This takes place 20 years earlier.

Mr. Burns

 * In Burns' Heir, when Mr. Burns' life flash before his eyes, we see a brief flash back of him as a baby, who fires his nanny.
 * In Rosebud, Mr. Burns grew up in a poor family as child, until a twisted, loveless billionaire came by and offered him to come live with him. He was also related to George Burns.
 * In Monty Can't Buy Me Love, Mr. Burns mentions that his first "gay" experience was when his father took him on a picnic at age 6.
 * In Them, Robot, Marge comments that Mr. Burns was originally a nice man when he first came to Springfield.