Bonky Fever - S4-E30
Continuity mistake: When the gang talks about Mikey's birthday party near the start, Gretchen's bicycle helmet constantly changes throughout the following shots. First, part of her helmet changes from purple to blue, then it's purple again and the straps vanish, then they reappear, then the helmet becomes red, then it's the correct colours again and the straps become blue, and finally, the straps change back to purple mid-shot.
Bonky Fever - S4-E30
Continuity mistake: When Mikey asks the lunch lady for more pudding for Bonky and she refuses, Mikey falls down on his back and starts throwing a tantrum. A second later, he has turned 90°.
The Secret Life of Grotke - S4-E32
Plot hole: In the scene where T.J. and his pals are trying to find the password to the building, they are using a cup telephone. When the man talks, they can hear him, but when the kids talk, the men on the other side can't hear them.
The Secret Life of Grotke - S4-E32
Continuity mistake: When the gang are sat at the table before Miss Grotke comes on, the table is empty, but when Miss Grotke comes on stage, they suddenly have drinks.
Continuity mistake: In the beginning, Gretchen says she's short on money, so she can't get a chocolate milk, just a white milk. But, when T.J. walks by with his food, Gretchen has a chocolate milk, such is evident from the brown carton.
Suggested correction: Gretchen tells the lunch lady that because she is one penny short, she will swap the chocolate milk (in her hand) for a regular. She puts the milk on her tray and walks off screen. Then, when T.J. walks past her, the camera pans over to Gretchen watching T.J. with that same chocolate milk on her tray she is holding. Gretchen got distracted by T.J.'s encounter with the lunch lady and stopped to watch him, but she was still going to swap the chocolate milk for a regular later on.
Chez Vince - S4-E41
Continuity mistake: In the cafeteria, TJ is wearing a suit to welcome the customers. But when he and the rest of the guys go to the teacher's lounge he's back in his normal clothes.
Continuity mistake: Gretchen starts talking to that man who doesn't talk, but later when Mikey is singing for the first time, you see that man booing him, then a minute later Gretchen is still talking to him.
Some Friend - S4-E44
Plot hole: They say in this episode that Menlo was always an organized freak. But in "Principal for a Day" it turns out that he was a hyper-major kid until he started working in the school office.
Beyond a Reasonable Scout - S5-E3
Other mistake: Phil the Scout ties a rope to Mikey's see-saw end's handle to lower Gus down without hurting him. Couldn't Mikey just climb off and hold the see-saw down with his hands and lowered Gus's end down slowly?
Suggested correction: Well, yes. He definitely could have done that. But I'd say that this belongs under stupidity, as they are defined as "stupid annoyances, like daft character behaviour," and this falls under that, to me. It's not really a "mistake" of any kind.
Audio problem: When Gus and Cornchip Girl are sitting in the principal's office, Lieutenant pats Cornchip Girl on the head and says, "Especially if the girl is as cute as," then Luke comes in and cuts him off. The camera cuts to Lieutenant before he says the word "as," but his mouth doesn't lip sync the word.
Other mistake: When Gretchen tells Mikey, "I'd be happy to help with matters of enunciation and syntax, of course," the soles of Gretchen's shoes are brown, as they should be, but then they turn white mid-shot. The next time we see Gretchen, they are brown again.
Lawson and His Crew (2) - S5-E12
Continuity mistake: After Vince discovers that Mrs. Finster's new cactus is missing from the windowsill, we see that Swinger Girl has it with her, on top of the roof of the school. However, when the shot changes to the new group (With Lawson, Skeenz, Kurts, Menlow, and Randall) Swinger Girl is suddenly standing right next to them. There was not enough time for her to have climbed down from the roof.
Continuity mistake: Near the end, Tyler T. and Tyler A. get their Tyler crests taken away. This stays as the camera follows them, but when the shot changes, all 4 Tyler crests are gone off the Tylers' jackets.