One mistake I have to point out is that in the flash back you had Mrs. Black's portrait gone-a new wall in place, but when Harry showed up with the goblin in current time it was back screaming...what happened?
As for Daphne, surely after having his own mind messed with by Dumbledore, and his friends personalities tweaked, he would realize what a pureblood dark father would/could do to his daughter to get what he wants? Hell even Hermione should have realized this. Does Harry know about the personalities changes?
As for Remus...a silver bullet isn't good enough, perhaps silver nitrate in his bloodstream. Did Sirius know Remus betrayed him as well?
Author's response
- Check again. Harry went to #12 with Lojak after his memory blocks were removed, the day before Hermione came to visit...
- He'll figure that out, give him time. He needs to get over feeling sorry for himself first.