Other mistake: The Diggers start digging a hole in the Ashleys' clubhouse, then it cuts to a shot of Gus pouring out the dirt. In this shot, there is a circular object on the roof of the cafeteria building (presumably a satellite dish) that has been left uncoloured.
Other mistake: After Miss Grotke asks the class which founding person said that they can't tell a lie, it cuts to a shot that pans over to Mikey. In this shot, all the kids' legs are missing from under the desks. Most of the chair legs are also missing.
Continuity mistake: When Gus is reading his paper to the class at the start, Phil is sitting behind Spinelli. Three shots later, his skin, pants, and shoes have all changed colour. His skin colour is proper again in his next appearance, but he is now sitting behind Jared. Two shots later, his shirt has changed from blue to black. His shirt colour is proper again in his next appearance, but his tie is now the wrong colour, and his shoes have changed colour again. Two shots later, his tie is coloured properly again.
Continuity mistake: When Mikey tells the gang that a music teacher is being sent over, there are doorknobs on the doors behind him, but in Mikey's close-up four shots later, the doorknobs have vanished, then they reappear a moment later.
Continuity mistake: On the day of the PTA Spring Fling, Principal Prickly wonders where Mikey is, and when Miss Finster says, "We've looked everywhere, sir," she wears her watch on her left wrist and her bracelet on her right wrist. In the next shot, the bracelet on her right wrist has been replaced with her watch. In the following shot, the watch has vanished from her wrist.
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: 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.
Character mistake: Gretchen finds a note on the lid of the treasure chest and reads it. We see a close-up of the note in her hands. The problem is that what Gretchen reads is not entirely accurate to what is on the note, and the whole last half of what she reads is not even written on the note; it gets cut off at the bottom.
Other mistake: After the kids start fighting over the treasure, T.J. gives a speech to them. Then, when it cuts back to the other kids, Ashley T's socks are mistakenly coloured the same as her skin instead of green, as they should be. This error is shown again in the shot after the kids drop the treasure chest.
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.
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 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.
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.
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 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 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.