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, 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
Other mistake: At the start when the gang change the time on the clock in the classroom, it wouldn't control the main school clock, plus in every other episode the clock has been operated by The Box on the side of the school, as shown in " The spy who came into the playground".
Plot hole: Whenever Gretchin calls Mikey up to the stand to explain what he saw, he says that he had followed Spinelli and Randall to the wooden fence, where he Saw Randall on his knees in front of Spinelli, begging for forgiveness, then Mikey began running to the other side to stop Spinelli from pummeling Randall with the "rock" but didn't make it in time. We then later find out that Spinelli had actually rescued Ms. Finster's cat out of a tree and Randall hit himself with the rock out of spite. But it is impossible that Spinelli could have given up on hurting Randall, climbed up a tree, rescued a cat, climbed down, handed the cat back to Ms. Finster, gotten praise from Ms. Finster, then have Randall attempt to pick up a big rock, then get a smaller one and hit himself with it in under 3 seconds (the duration of how long Mikey ran before he heard Randall's scream).
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.
Audio problem: After "Peanut Butter Kid" retrieves the baseball Vince hit (presumably all the way to China) Spinelli screams rather loudly. However her lips don't move when she does.
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.
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.
Other mistake: After Dave takes away Mikey's lunch tray, it fades to a shot of the school clock, and there is no 5 on it.
Continuity mistake: Throughout the scene where Spinelli shows off her jump roping skills, the two Ashley's swinging the rope quite awkwardly and choppily go from a normal to a surprised expression every second or so.
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.
Factual error: At the end when Ms. Finster tells Randall to give her the names of the kids involved with the ball incident, she says to list them in alphabetical order. The first name Randall says is "Dettweiler, T.J." But "Blumberg, Mikey" would actually come before that, and given what we know of Randall, this isn't the kind of mistake he is likely to make.
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.
Continuity mistake: In this episode, it shows Randall in Miss Grotke's class, but in every other episode, it's never shown him in there.
Audio problem: When Tubby is about to win the race, Mikey shouts "Run Tubby run" in Spinelli's voice.
Suggested correction: Not really. It definitely sounds like Spinelli due to how he screams the line, but it's not Spinelli's voice. Something similar happens a moment earlier in the episode, when Mikey screams, "Win, win, win!" His voice gets a bit raspy, similar to Spinelli's raspy voice, but those aren't the same voices. Also, I don't know why they would have Pamela Adlon (Spinelli's voice actor) record that one line for Mikey anyway.
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: When Gretchen is playing with Cornchip Girl, she puts down a card which is the orange cheetah. but after she has talked to TJ, it has suddenly changed to a completely different animal.