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?
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.