
I'm sorry if sometimes I can't report the exact quote but I have the Italian version, so I can only try to translate...
1) In Chapter One, when Hagrid arrives with the motorbike, Dumbledore asks him where he had found it. The answer is the following:
"A loan, professor Dumbledore" said Hagrid "by young Sirius Black"
That's great ! Isn't it ? So the motorbike was property of Sirius and maybe it will become Harry's !!! I think we'll see the motorbike again !!!
2) In Chapter Four, when Hagrid tells Harry the whole story of Voldemort, he says that among the wizards he had killed, there were the Bones. Maybe the parents of Susan Bones ? I have read in some topic in this forum someone say that Susan may become important in the next two books. Maybe...
3) At the end of Chapter Seven, Harry has a nightmare in which Professor Raptor (sorry, I don't know if it's only the Italian name, anyway he's the DADA teacher of First Book, as a matter of fact Voldemort himself) tells him he must get to Slytherin and so on... And then he sees a green light and wakes up trembling... An anticipation of Legilimens ???
4) There is already a topic on this, I have seen: there is a passage in which JK says: "...yet he sometimes had the horrible feeling that Snape could read minds".
5) A quote from Dumledore in Chapter Seven (I try to translate):
"Ah, music ! A kind of magic which overcomes all the ones we're doing here". Maybe he will really use it in the next books ???
6) In Chapter Six, reading what is written behind Dumbledore's picture-card, Harry reads that Dumbledore is famous for having won in 1945 the famous Dark Wizard Grindelwald (that's the name in the Italian version).
Do we know anything else about this Grindelwald ?