Wild Child - S2-E6
Continuity mistake: In the episode "Nobody Don't Like T.J.", the kid who doesn't like T.J. is Gordy. In this episode, "Gordy" is referred to as "Freddy".
Yes, Mikey, Santa Does Shave (2) - S2-E18
Factual error: In the actual play, T.J. is the Spirit of Hanaukkah, and he has 7 candles on his costume. However, there's 8 nights of Hanaukkah.
Mama's Girl - S2-E14
Continuity mistake: Before Spinelli calls out "Mama." Mrs. Grotke is stepping into the mud with her right foot. After she says it, she's stepping in with her left foot.
Pharaoh Bob - S2-E12
Factual error: The history teacher who gives King Bob the idea about the pyramids says, "After over 4,000 years, we still know their names: Ramses...Amenhotep." But Amenhotep never built a pyramid, he built great complexes. No pyramids.
Continuity mistake: When TJ announces that there will be no gum sharing, it shows Gretchen in the classroom. There is a kid sitting behind her. However, this is the same kid who is caught running in the hall, who Ms. Lemon says is a sixth grader. The gang is in fourth grade.