[Alastor]

UNANSWERED QUESTIONS

Why was Peter Pettigrew in gryffindor?
Discussion can be found in Why was Peter Pettigrew in Gryffindor? v3

How did Hagrid fly to the Rock in the Sea?
Discussion can be found in How did Hagrid fly to the Rock in the Sea?

Wizards and warlocks - what's the difference?
JKR has never, to our knowledge, addressed this question. Sorry!

ETA: See the Tales of Beedle the Bard

How did voldemort get his wand back?
Discussion can be found in How did Voldemort get his wand back?

What happened to Sirius's bike?

JK Rowling's World Book Day Chat, March 4, 2004 Rita: Whatever happend to Sirius' flying motorbike? JK Rowling replies -> Ah, good question. You'll find out, but the real sleuths among you might be able to guess.

Link
Discussion can be found in Where is Sirius's motorbike?

And, as we saw in DH, Hagrid still had it.