Other mistake: When Bart enters the school bus at the day of history test, we see close-up of his "Early American History" book open about in the middle, on the page saying "Chapter 1". (00:06:10)
Other mistake: When The Town is singing the Christmas carol you can see Sideshow Bob, who was arrested and jailed in series 1. We know he hasn't been released, as that's a plot point over the show. (00:18:10)
Suggested correction: Maybe he was allowed to participate due to good behavior. That's a possibility.
Rubbish. He is denied parole numerous times and shown to be a high risk prisoner.
Ssiscool ★
Good behavior or not, a prison wouldn't furlough an inmate just so they could participate in a snow day.
Phaneron ★
I'm not sure if it's been discussed here or listed as a mistake. Part of the problem with "The Simpsons" and the Sideshow Bob character is that time both moves forward and doesn't move. In "A Brother From Another Series," Krusty visits the prison and tells Bob he hasn't seen him in years because Bob had been in prison all those years for his crimes. Yet Bart and Lisa are still the same age and in the same grade. Bob is also let out of prison on a work-release program in the episode.
Bishop73