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.
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.
Continuity mistake: The gang goes to Spinelli's house to ask her about her parents. After Gretchen asks why her parents don't ever come to Parents' Night, Spinelli tries to close the door, then T.J. puts his hand on the door and says, "Come on, Spinelli, we're your friends." In the next shot, his hand is suddenly not on the door anymore. (00:04:46)
Continuity mistake: At Parents' Night at the school, the doorknob is on the left side of the door to Miss Grotke's classroom. Then, when Spinelli and her "parents" go out of the classroom, the doorknob is on the opposite side, then goes back to the left side in the next shot. (00:07:34)
Continuity mistake: At lunch, when the kid tells the gang that Spinelli's parents will be the first parents on the space shuttle, Gretchen's sandwich is in front of her on the table. In the next shot, it changes orientation. (00:02:47)
Continuity mistake: When the gang is first shown talking about Spinelli's parents at the lunch table, T.J. is holding his sandwich in his right hand, but in the next shot, it's in his left hand. (00:02:26)
Schoolworld - S4-E21
Continuity mistake: The door to Miss Grotke's classroom opens inward throughout the episode. However, when SAL mimics Principal Prickly and tells all the teachers to report to his office, Miss Grotke leaves the classroom, and the door now opens outward. Then, when the kids look outside the classroom, the door has completely vanished.
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 the gang is playing marbles, there are seven marbles in the ring, with three black ones on the left and four orange ones on the right. In the next shot, there is suddenly a green marble on the right side of the ring, with a black marble next to it.
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.
Schoolworld - S4-E21
Continuity mistake: When Gus gets locked out of the school after recess, he asks SAL to open the hallway door. He looks up at the clock, and the time on it is 10.46.05 (then goes up to 10.46.08 by the end of the shot). A few seconds later, the time changes to 18.46.16, then 10.46.17, then 10.45.18.
Continuity mistake: When Randall begs Gretchen to do his homework, Mikey says, "Tutoring is just another word for helping," and his backpack is green. A few seconds later, it changes to blue.
Continuity mistake: When the marble gets knocked out of Spinelli's hands and it falls into the drain, the marble approaches the hole to the very left of the drain, but in the next shot, it falls into the hole right next to it.
Continuity mistake: When Dr. Quilty is filming Gretchen in front of the Kindergarten Area, Gretchen puts some candy in front of the door. When Gretchen runs away, the candy has vanished.
Continuity mistake: When the kids are fighting over the can at the celebration, the can keeps swapping between green and red between shots. There is also one shot where the can is red but turns green twice in two frames.
Spinelli's Masterpiece - S4-E27
Continuity mistake: When the kids are all on the jungle gym to see Spinelli's drawing, Jerome can be seen sitting on the bar of the swings. However, when everyone is cheering he has suddenly moved to the ladder.
