I've been watching the SICP lectures again and rereading the book in light of what Ableson and Sussman emphasize. Their restaurant runs specials but they ain't free. It's only because the wizards are so junior that they don't immediately see Hogwart's darkside.
Can you say how the reading changes in light of the videos? I skipped the vids because I'm hard of hearing, but maybe it'd be worth the trouble to look again with auto-transcription.