Oh! Brillant question! I think he would have surpressed more memories of Lily- that would have been an awkard conversation between Snape and Harry..so- perhaps it was that he showed up uninvited to her wedding and sulked at the back unnoticed? Perhaps the meeting with Dumbledore- yes, I think that would be one- When Snape was a Death Eater and asked DD for her protection-- Actually, I think alot of the memories we saw in DH would have been there--all those memories he had, he wouldn't want anyone to see unless it was absoultley neccasary-especially Harry. He would also hide how exactly close he was to Voldy- it gets reveled in the end, of course- that he was on Harry's side BUT..the man is pretty convincing. Oh, and he would of hidden alot of his childhood, I know we already got a glimpse of it that wasn't stored away, but I'm sure there would be a climatic point of particular misery he hid..
Look at me, getting all excited :)
Well When Lily and James died, the fieldus charm broke, therefore allowing anyone access on the house.
Because Greyback wasn't in his wolf form when he attacked- yet he (Fenrir) is still a werewolf, so while Bill didn't get turned into one, his face was severly cut (as you know)
Sorry, I'm not sure:(
Fantastic questions! Thanks for that, it got me pumped for more HP (not that I really needed any pumping)..
Cheers + have a good week