These have been driving me crazy:
What did Dudley think of when he saw the dementor? What could be his worst memory?
"We shall have to send all the students home tomorrow," said Professor McGonagall. "This is the end of Hogwarts. Dumbledore always said. . ."
What did Dumbledore always say?
How is Voldemort the last remaining descendant of Salazar Slytherin? If Slytherin lived before c. 993, he could have any number of descendants living today.
And finally, does Slytherin have any connection with the Portuguese dictator Antonio Salazar?