Continuity mistake: In the introduction, when TJ pulls the ball off Gus, Gus is covered in gum. When they are walking into the school, the gum has disappeared.
Continuity mistake: Across the show, the number of kids in a class/what kids are in which class varies. For example, in "The Great Can Drive", the Ashleys are in Ms. Furley's class. However, in almost every other episode besides this one, the Ashleys are all in Ms. Grotke's class, and the exception are a couple of episodes in which 2 Ashleys are in Ms. Grotke's class, and the other 2 Ashleys are in another class (which is not specified by name), making a serious consistency error.
The New Kid - S1-E2
Continuity mistake: In the beginning, after the kids have gone to recess, Vince starts talking to TJ about Gus. The number of bricks between the windows on the wall behind them and the bricks' position changes four times.
The New Kid - S1-E2
Continuity mistake: In the beginning, as Gus' dad walks away, the A/C duct goes way down the hallway, and one side is halfway in one tile and the other side is halfway on another tile. When Gus is talking, the duct is much shorter, and the whole duct is contained in one tile.
The New Kid - S1-E2
Continuity mistake: Near the beginning, after King Bob declares Gus as The New Kid, the kids are cheering and TJ and friends have disappeared from the shot. Then Gus looks down in front of him and the guys are right there in front of him.
The New Kid - S1-E2
Continuity mistake: In the beginning, as Gus' dad walks away, there is a sign on the door to the right that says "Boys." I would assume this is a restroom. Then, two shots later, it shows Gus from his front and in place of that sign is a window.
The New Kid - S1-E2
Continuity mistake: When Gus' dad introduces himself, he says he's in the USMC (US Marine Corps). In the rest of the episodes, he's in the Army.
The New Kid - S1-E2
Continuity mistake: When Spinelli says, "Roger already, let's get this show on the road", there's a puffy cloud under "Good" in "Good Morning Gus". When Gus is in the bus and notices the billboard, the cloud is pushed in on the upper left part of it.
The New Kid - S1-E2
Continuity mistake: In the beginning, right as Mrs. Grotke asks for Gus to describe his "personal journey", there is a short kid with a white t-shirt and dirty blonde hair, with the globe behind his head. As the kid asks if they can go to recess now, the globe has moved way to the left.
The New Kid - S1-E2
Continuity mistake: In the beginning, as Gus' dad walks away, the lights on the ceiling are 3 tiles apart. However, while Gus is describing his "personal journey," the lights are two tiles apart.
The New Kid - S1-E2
Continuity mistake: In the beginning, Gus' dad steps aside to reveal Gus behind him. Then, he says, "Well, my duty here is done. Mrs. Grotke, boys and girls," and then salutes them and walks away. He has moved back behind Gus. He had no time to move to that position.
Continuity mistake: When Vince's family is eating dinner, Chad's bow tie changes at least twice from red to black.
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.
The Legend of Big Kid - S1-E14
Continuity mistake: At the end of the episode, when the gang is caged, right after Vince gives TJ the baseball card, TJ's facepaint turns from blue to red, then back to blue. (00:08:35)
Continuity mistake: The kid who says "Dumb 4th graders..." IS a 4th grader. Watch the beginning of "The New Kid" and you can see him in Mrs. Grotke's class.
Continuity mistake: When TJ is in The Box, he lays down and puts his head on his baseball glove. Then when he gets up, he doesn't pick it up, but it's nowhere to be seen. Then a couple of shots later, it's back, and it's on the other end.
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.
Continuity mistake: After Mrs. Finster has her show of strength and is pulling Gus away, he still has the chains from the wheel on his arm. When the shot changes, the chains are gone.
Continuity mistake: When Mikey's music teacher gets engaged to the Spanish guy, her ring disappears between shots.
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.