Continuity mistake: When the boy in the blue shirt tries to make an appointment for a haircut, the book on Gus's desk is blue, but when the kid leaves, it changes to green.
Continuity mistake: After T.J. and Vince walk out of the school while mocking Mademoiselle, it cuts to a shot of the rest of the gang, and Spinelli is standing behind Mikey. Two shots later, Spinelli has vanished from behind Mikey, then reappears a moment later.
Continuity mistake: When T.J. walks out of the school while mocking Mademoiselle, he is not wearing his backpack, but in the next shot, he is.
Continuity mistake: In Mikey's flashback, when Mikey's father enters the house, he is not wearing an undershirt. Two shots later, he is wearing a blue undershirt under his collared shirt (either that, or his skin is miscoloured), which disappears in the next shot. His belt buckle also changes from dark blue to light blue, and his necklace changes design when little Mikey jumps on him.
Continuity mistake: At the dance class, when Mademoiselle asks where the new girl (Spinelli) is, the girls point to the curtains, and there is a shot of the curtains with a door on the right side of them. Later on, Mikey enters the class through that door, which is now on the opposite side of the curtains.
Mama's Girl - S2-E14
Continuity mistake: When Spinelli goes to sit with the other kids at lunch, there is a kid in a red shirt sitting behind T.J, eating his lunch with his spoon. When Spinelli slaps her tray away from her, this kid's right arm is now suddenly resting next to his tray, and his spoon disappears from his hand. He then changes the position of his body and hands, and in the next shot, he's back to his original position.
Continuity mistake: When TJ is making the morning announcements, the Ashley who wears green is sitting behind Spinelli. When he says there will be dessert after lunch, the desk behind Spinelli is empty.
Continuity mistake: When Gretchen is playing with Cornchip Girl, she puts down a card which is the orange cheetah. but after she has talked to TJ, it has suddenly changed to a completely different animal.
Continuity mistake: When TJ makes the morning announcements, in the first scene of the classroom we see a boy in a blue hat sitting in the back row. After TJ says that the kids can refuse to answer a teacher, the same kid is suddenly sitting in the second row so he can slap hands with someone in the first row.
Continuity mistake: When TJ comes to school in the morning and everyone starts cheering, we see two Ashleys clapping with everyone else. As the camera follows TJ as he walks to the entrance, we see the same two Ashleys a second later.
Mama's Girl - S2-E14
Continuity mistake: After Miss Grotke avoids the mud puddle, a kid says, "Spinelli just called Miss Grotke Mama!" In this shot, Ashley Q is near the left side of the screen, Ashley B is near the right, and the other two Ashleys are nowhere to be seen. In the next shot, all four Ashleys are suddenly shown together, laughing.
Omega Kids - S2-E16
Continuity mistake: When TJ tells Vince to throw him a pepperoni pizza, Vince has two pizzas - one in his hand and one on his plate. In the next shot the pizza on the plate has vanished.
Continuity mistake: When Randall and TJ are walking across the playground, Randall's hair has turned black and so has TJ's hat.
Continuity mistake: When the gang is eating lunch, there is a girl in a pink shirt and some other people at the table behind them. When it cuts to behind Prickley and TJ, the kids at that table are different.
Continuity mistake: After T.J. has become principle for a day, it shows him chewing out a kid for running in the halls. He throws down a manilla folder onto his desk in anger. However, when the shot changes, the folder has disappeared.
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".
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.
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.
