Corrected entry: During "Wheels", Puck says that "[Brittney] is always cheating off [Becky]'s test papers in math class." Yet in a previous episode, he says he hasn't been to a math class in three years.
Corrected entry: During "Home", when Sue is talking about the Master Cleanse, she says she hasn't had a solid meal since 1987. Yet in a previous episode "Mattress", when she talks about having eye surgery, she is eating a container of lasagna. I'm pretty sure lasagna counts as a solid meal.
Correction: It was yams, not lasagna. And I'm pretty sure it was a joke, and supposed to be absurd, not necessarily a continuity error.
Correction: That does not mean that he isn't aware that Brittney cheats off of Becky.