Simpsons Already Did It - S6-E7
Character mistake: Butters says that he watched "all 132 episodes" of the Simpsons; at the time this episode aired, 291 episodes of the Simpsons had been produced and aired.
Character mistake: While testifying during his murder trial, George Vogelman says that he's gone on dates but has never been in a relationship. However, when he sued Ellenor during season 2's "Sex, Lies and Monkeys," he says they discussed his first marriage and his kids, which contradicts his later testimony. While it's certainly possible he could have been lying about having a family, that would mean he was lying to Ellenor about it, but as his lawyer, she takes him at his word as if he didn't have a history of lying.
Character mistake: When Walker and Satch are in the car looking for Walker's son, Walker tells Satch his son is 17. Afterward, when they are out on the streets, Walker asks some people if they have seen his 18-year old son.
Suggested correction: Butters is always shown as being a bit dim and slow. As a kid it's easy for him to make a mistake in thinking that there was only 132 episodes.
Ssiscool ★
That's why it's called a "character mistake"; also, Butters is certainly naive, but he's hardly what I would call "dim and slow."
zendaddy621