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?
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.
