The Good, the Sad and the Drugly - S20-E17
Corrected entry: When Willy is knocked out by the falling letters, there are 3 Ns that fall sideways next to his head, making it appear as if he was sleeping. There are only 2 Ns in "Springfield Elementary School."
Corrected entry: When Lisa walks into the church thinking she's the gem, Mother Teresa comes and changes the word puzzle from "Regally, The Rock Gem Is Lisa" to "It's Really Maggie, Sherlock" You can see that the "s" from "Is" in the first puzzle is not used at all in the second puzzle, and the "S, H and E" from "Sherlock" was taken from the "H and E" in "The" from the first puzzle, which means they used two "s" without even using the "s" from "Is" in the first puzzle. (00:18:35)
Correction: The S from "Is" becomes the S in "It's" the first word in the 2nd puzzle. There's 2 S's in both the puzzles if you actually read it.
In the Name of the Grandfather - S20-E14
Corrected entry: Homer and Grandpa apparently buy the pub in a drunken mistake. The previous owner says, "You sure do know a lot about Irish Real Estate Law". However, the episode is set in Northern Ireland and so any laws are those of the UK. He wouldn't make that mistake.
Correction: While Northern Ireland is part of the UK, the laws differ slightly between Northern Ireland, Scotland, England and Wales, so therefore what he said is true.
Correction: If you look closer at the N nearest Willie's head, it is actually the "M" from "Elementary" with a piece missing.