Firestarter: Part 1 (Book 7, Chapter 33)

Here's She Drives Me Crazy by Fine Young Cannibals. 

Valhalla is essentially Norse Mythology's Heaven. 

Here's a deep-dive from Harry Potter Wiki about wizarding bloodlines.

Marie Blood was the niece of Harry Houdini and passed away in 2004. You can read her obituary here. 

The phrase "sour grapes" comes from The Fox and the Grapes, one of Aesop's Fables. You can read the whole story here. 

And finally, here is Separate Ways (Worlds Apart) by Journey (and here is the excellent remix made for Stranger Things Season 4).