I'm currently re-reading "Harry Potter and the Order of the Phoenix" and I've noticed a few things that I find curiously coincidental.
First, there are only 12 members of the Order of the Phoenix (besides Dumbledore) mentioned in the book: Sirius, Lupin, Moody, Tonks, Kingsley, Mr. Weasley, Mrs. Weasley, Bill Weasley, Snape, Sturgis, Mundungus, and McGonagall. (Now I may have missed someone, so just let me know if I'm off in left field.) Remind you of any other group of people? Maybe from the New Testament? Who's leader died? Would that make Snape Judas? Is is proof that Dumbledore is coming back? Hmmmmm.
The other thing I've noticed rereading the series is that all Trelawney's spoken prophecies come true! Not the ones related second hand, and not just the ones she gives in her wired voice. For example, in "Goblet of Fire" she says (paraphrasing) death is hanging over the school. Harry selfabsorbedly assumes she means he will die, but if you look at the actually wording of the prediction, he isn't mentioned. It's Cedric who dies. In OotP she tells Umbridge she is in 'grave danger'. It's a little far fetched, but Umbridge does get hauled off by centaurs. And in "the Half Blood Prince" she mumbles something about towers on fire and the dark mark appears over Hogwarts. I haven't done any extensive checking on this (ie. finding all the spoken predictions and comparing the results) so I could be totally wrong. Feel free to point out my mistake!