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?
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.