Well, it doesn't "correct" itself later. It just says wrong things and gets the right answer anyways, because this encoding is so simple that many college fresh

Well, it doesn't "correct" itself later. It just says wrong things and gets the right answer anyways, because this encoding is so simple that many college freshmen could figure it out in their heads. Read the transcript with a critical eye instead of just skimming it, you'll see what I mean.