Ooo, I really like some of these theories! I didn't know about the Arthurian hallows. The title makes much more sense now.
I also think Neville was memory charmed (by Lockhart, maybe?
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The Petunia thing is going to be interesting, but I don't think she'll perform magic. Maybe Dudley will? But I love the idea of Filch finally doing it to protect the school--or maybe just Mrs. Norris! There's a lot of time spent in the second book on Filch's Qwikspell course, and it doesn't really affect the plot of book 2 so it's got to be there for a reason.
I agree with the idea that there's too much about the night Lily and James were killed that is unknown. I just reread the first book for the first time and the timelines just don't add up. McGonagall sits at Privet drive all day the next day and Harry arrives with Hagrid the following evening. Hagrid says "He fell asleep over Bristol," which would indicate that they came straight from Godric's Hollow. I find it hard to believe that a magical motorcycle journey could take 12 hours! That's why I think there's some sort of time travel involved somewhere.
A couple more interesting things from my rereadings:
Dumbledore apparates without noise in the first chapter of the first book. I think this may be significant. He can also make himself invisible without a cloak. Now, if he's a bumblebee animagus as some of the theories I've seen suggest, that would explain it. Otherwise, it's yet to be explained.
) in preparation for the last one.
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