Skinner/Tamzarian doesn't know who Ned Flanders is, despite the fact that Skinner/Tamzarian once conspired with Bart and Homer to get Flanders fired from being a principal.
At the station, the railroad has no ballast.
The real Skinner is very husky for someone who's allegedly been in a Chinese slave labor camp for 20 years and just got out last week.
The real Seymour Skinner has been free a whole week but neither he nor anyone from the state department or Pentagon called his mother to let her know.
Judge Snyder has been depicted with a dark complexion since Season 1, but in this episode he has fair skin.
At the beginning, Skinner plays a tuning fork, but he should have place the handle onto a resonating surface to hear a sound.