One thing that I found interesting but that I haven't noticed anyone else mention.

In chapter 76, we have:

But, as Hermione had explained to Millicent, prophesying wasn't controllable, there was no way to ask for a prophecy about anything in particular. Instead (the books had said) there was a sort of pressure that built up in Time, when some huge event was trying to happen, or stop itself from happening. And seers were like weak points that let out the pressure, when the right listener was nearby. So prophecies were only about big, important things, because only that generated enough pressure; and you almost never got more than one seer saying the same thing, because afterward the pressure was gone. And, as Hermione had further explained to Millicent, the seers themselves didn't remember their prophecies, because the message wasn't for them. And the messages would come out in riddles, and only someone who heard the prophecy in the seer's original voice would hear all the meaning that was in the riddle. There was no possible way that Millicent could just give out a prophecy any time she wanted, about school bullies, and then remember it, and if she had it would've come out as 'the skeleton is the key' and not 'Susan Bones has to be there'.

But in chapter 63, we have:

Final Aftermath:

She came awake with a gasp of horror, a disruption of her breathing that left her feeling deprived of air and yet her lungs didn't move, she woke up with an unvoiced scream on her lips and no words, no words came forth, for she could not understand what she had seen, she could not understand what she had seen, it was too large for her to encompass and still taking shape, she could not put words to that formless shape and so she could not discharge it, could not discharge it and become innocent and unknowing once more.

"What time is it?" she whispered.

Her golden jeweled alarm clock, the beautiful and magical and expensive alarm clock that the Headmaster had given her as a gift upon her employment at Hogwarts, whispered back, "Around two in the morning. Go back to sleep."

Her sheets were soaked in sweat, her nightclothes soaked in sweat, she took her wand from beside the pillow and cleaned herself up before she tried to go back to sleep, she tried to go back to sleep and eventually succeeded.

Sybill Trelawney went back to sleep.

This aftermath was widely considered to have been Trelawney giving a prophesy. However, as we just found out (assuming that the information Harry and Hermione gathered is accurate) that prophesies aren't given, the pressure doesn't get released, unless the right person is nearby. However, Trelawney appeared to be alone in that aftermath. This opens a number of different options.

• The information from the books is wrong.
• Trelawney was not as alone as she appeared.
• The speculated recording spells count as being the right nearby listener. Interestingly, this could mean that Dumbledore isn't the right listener, if others also have recording or listening spells around Trelawney.
• Trelawney wasn't actually giving a prophesy. The first time I read it, I thought that she "couldn't discharge it," and then it did discharge but didn't realize, because she could never remember her prophesies. But with this new information, that suggests to me that perhaps all of the pressure was building and building, but it was unable to vent itself at that time because the right person wasn't there. If this prophesy is similar to the one in canon, then that means it won't express itself until she's near Harry Potter.

Does anyone else see anything that I missed?