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.
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.
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.
Continuity mistake: When Randall and T.J. are walking across the playground, Randall's hair has turned black and so has T.J.'s hat. This mistake has been fixed on Disney+, and possibly other newer releases.
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.
Continuity mistake: When Spinelli arrives at school at the end, she holds her purse in her hand, but it disappears two shots later. It reappears when the gang starts to play tag.
Continuity mistake: When Spinelli and Pat Patterson sit on the bus bench, the text on the bench that says "Just Buy It" has a period at the end, but the period is missing in all the following shots.
Continuity mistake: When Pat Patterson tells Spinelli that they should have a seat on the bus bench, the bench is missing the word "Gumoflex" and the black gum logo that it had in a previous shot. They both reappear when Spinelli and Pat sit on the bench.
Continuity mistake: When Menlo tells the crew about Randall's joke book, he loosens his tie, and it's still loose when he says "Indeed." But half-a-second later, as he walks away, his tie is back to normal.
That Stinking Feeling - S3-E11
Continuity mistake: When Spinelli's father is first shown watching TV, there is no ring on his left hand, but one appears on his ring finger in the next shot. The ring then vanishes and reappears in the following shots. (00:03:32)
Continuity mistake: When the Diggers lift the treasure out of the hole, there is a lock on one side of it. Three shots later, the lock had moved to the opposite side of the treasure chest. The lock then vanishes and reappears in the following shots.
Continuity mistake: After Mikey pours dirt into the hole, he holds the bucket in his right hand, but it disappears in the next shot.
Continuity mistake: When Vince and Spinelli are talking in front of the bathroom doors, when Spinelli says, "How about you and me sneak out... just the two of us," the push plate is missing from the boys' bathroom door, then it reappears a shot later.
Continuity mistake: When the Diggers lift the treasure out of the hole, the handles on the sides of it are yellow. Then, when the kids start fighting over the treasure, the handles change to gray; then they are yellow again after Gretchen finishes reading the note.
Continuity mistake: After the scene of Vince and Spinelli talking in front of the bathroom doors, it cuts to kids leaving the school, and the doors are left open after they all leave. Two shots later, they are suddenly closed. Doorknobs also appear on the doors, which weren't there before.
Continuity mistake: After the scene of Vince and Spinelli talking in front of the bathroom doors, it cuts to kids leaving the school, and Gretchen has her backpack on. In the next shot, it vanishes.
Continuity mistake: When T.J. runs out of the school with the history book, the book is red, but it changes to blue in the next shot, then back to red.
Continuity mistake: When Miss Grotke gives T.J. an old copy of the history book, there are two kids sitting in the desks behind T.J., but they vanish two shots later.
