Continuity mistake: Near the end, Tyler T. and Tyler A. get their Tyler crests taken away. This stays as the camera follows them, but when the shot changes, all 4 Tyler crests are gone off the Tylers' jackets.
Some Friend - S4-E44
Plot hole: They say in this episode that Menlo was always an organized freak. But in "Principal for a Day" it turns out that he was a hyper-major kid until he started working in the school office.
Continuity mistake: Near the end, Gus is standing between the two handball walls. He is looking back at TJ and Lawson, who are near the first wall. But as the camera pans out, TJ and Lawson have moved to the other handball wall.
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.
Continuity mistake: In the beginning, Gretchen says she's short on money, so she can't get a chocolate milk, just a white milk. But, when T.J. walks by with his food, Gretchen has a chocolate milk, such is evident from the brown carton.
Continuity mistake: When Spinelli gets the ball to play in the field behind the trees, you can see lines that would indicate that the ball was a basketball. However, when the kids are playing kickball, it's obviously a kickball.
Continuity mistake: When The Library Kid is telling her story to the gang, her flashback includes a visual of her walking into the kindergarten class. The kindergarteners shown are the same kindergarteners in the current timeline, however Gretchen explains that the kindergarteners used in the flashback are now in 4th grade. (00:03:15 - 00:03:45)
Continuity mistake: When Spinelli is challenging the hustler kid, she asks for Gretchen's bow (for a blindfold). In the shots after that, Spinelli is still blindfolded with Gretchen's bow, yet Gretchen is still wearing it.
Continuity mistake: When library kid sees her kindergarten class she's wearing a dress but when she runs into the library she's wearing a t-shirt and skirt.
That Stinking Feeling - S3-E11
Factual error: When Lawson catches the ball in the end-zone, you realize he's NOT in the end-zone.
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.
Lawson and His Crew (2) - S5-E12
Continuity mistake: After Vince discovers that Mrs. Finster's new cactus is missing from the windowsill, we see that Swinger Girl has it with her, on top of the roof of the school. However, when the shot changes to the new group (With Lawson, Skeenz, Kurts, Menlow, and Randall) Swinger Girl is suddenly standing right next to them. There was not enough time for her to have climbed down from the roof.
Factual error: After Digger Dave and Digger Sam split up, they show that Sam was unfocused and was digging everywhere. Even through concrete?
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.
Factual error: When Menlo is hoppin' scotch, he lands on 10 with both feet, and 10 is a single square.
Audio problem: When Randall says, "Way to hop, man." his mouth doesn't move when he says 'man' until after he's finished saying it.
Here Comes Mr. Perfect - S4-E18
Continuity mistake: When Jared is talking to the whole school about shunning him, his undershirt changes from white to blue to white again.
Continuity mistake: In the time before King Bob tells his story about being the Prankster Prince, no one is on the jungle gym except TJ and his friends. But after Bob finishes, around 20 kids are on the jungle gym, plus TJ and co. There was not enough time for ALL those kids to get on top of the jungle gym from the time King Bob started his story to the time he finished.
Revealing mistake: In the areas where the kids change the tape, when Mikey slides and Spinelli is swinging, they are both holding cameras. Who's filming them?