Continuity mistake: At the start, the books that Miss Grotke gives to the class are red, but they all change to blue in the next shot.
Other mistake: When Miss Finster walks into Principal Prickly's office, her waistband is mistakenly coloured yellow, but when she starts to leave his office, it is white again as it should be.
Other mistake: When Miss Finster drinks the cup of dirt and spits it out, her waistband is mistakenly coloured grey. Then, when we see her again a moment later, it is white again as it should be.
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.
Other mistake: When T.J. discovers the directions to the treasure inside the old history book, Gretchen's left shoulder is going over T.J.'s desk, and there is a big white line going through the bottom of the desk. It seems as if T.J.'s desk has been shifted up slightly in this shot.
Other mistake: When the gang catches the Ashleys and Randall taking the treasure in the Ashleys' clubhouse, in the shot after Spinelli says, "Since when is Randall an Ashley?", the lines on the wall are mistakenly drawn over the plant in the background.
Other mistake: When we first see the gang inside the Ashley's clubhouse, in the shot after T.J. says, "Ladies, you have a deal," there is a big white line at the bottom of the screen behind the characters; the background seems to have been shifted up slightly in this shot.
Other mistake: When T.J. tells the gang that he is sure that the treasure will make them all millionaires, Gretchen's sash around her dress is mistakenly coloured blue, and in the next shot, it is pink again as it should be.
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.
Other mistake: At Parents' Night at the school, when Gretchen's parents walk into Miss Grotke's classroom, Gretchen's father clips through the door. (00:05:46)
Continuity mistake: When Gus is hiding behind the trees at school, no one is standing behind the fence, but in the next shot, the gang suddenly appears behind it.
Continuity mistake: When the gang sees Gus standing next to the tree, T.J. has his backpack on, but when the cops arrive, his backpack vanishes. The straps also change from grey to blue.
Bonky Fever - S4-E30
Continuity mistake: When the gang arrives at Mikey's house with his birthday gifts, Gus wears a red bow tie. Then, when the gang walks up to the door, Gus's bow tie has changed to the same color as his shirt, then goes back to red in the next shot.
Other mistake: When Gus and T.J. are talking on the bench, as Gus says, "No, at least not yet," his watch is missing from his wrist; then it appears mid-shot.
Bonky Fever - S4-E30
Continuity mistake: In the cafeteria, Mikey asks the lunch lady for more pudding for Bonky. When the lunch lady refuses, the clothing on Mikey's Bonky puppet has vanished, then it reappears in the next shot.
Bonky Fever - S4-E30
Continuity mistake: After the gang gives Mikey his backpack full of Bonky stuff, Mikey runs away from them, and he is heading towards two kids playing marbles. Then, when Mikey slips on the marbles, they have changed colour.
Bonky Fever - S4-E30
Continuity mistake: When the gang arrives at Mikey's house with his birthday gifts, note the colours of the gifts that Gretchen and Gus are holding. When the gang looks at Spinelli's gift, Gretchen and Gus's gifts have swapped colours, then they swap back in the next shot.
