6. Ghost Snape (with snark). 7. Hogwarts is infested with ghosts (okay, more infested) after the Second Battle. (Everyone who died in the Battle is now haunting Hogwarts. 8. Hogwarts can't be repaired after the battle. 9. There hasn't been a female Malfoy born in 200 years. 10. Human memory, especially under stress, is unreliable.