1. Sam knows the name of every president, in order. 2. Sam knows how to hack into pretty much any municipal police system. 3. Sam knows Dean taps the steering wheel with his right thumb three times every time the engine turns over. 4. Sam knows how to hustle a decent bankroll playing pool, even though he mostly leaves it to Dean. 5. Sam knows he'll save Dean, knows he can't not.
1. Sam doesn't know how his brother sleeps around the way he does and doesn't have some painful and embarrassing social disease. 2. Sam doesn't know when he'll ever stop dreaming about Jess. 3. Sam doesn't know why him. 4. Sam doesn't know the exorcism right off by heart, though it's way more important now than the presidents. 5. Sam doesn't know how he'll save Dean. But he knows he'll do anything.