Every character in a John Hughes movie is fucked in the head.

[Krythor]

Who says that his intelligence is decided based on his ability to subvert the routine of every day life? You said yourself that he continues to show close ties to the school even on his day off. Maybe he's intelligent because he does go to school most of the time? The message of the movie is more light hearted than "down with the system." In fact I'd say it's the opposite of that, and a message that this thread should probably take on board: relax. I don't think it's unintentional either; the idea of it being anti-establishment has never occurred to me.