2. Why Can't The Doctor Go Back And Visit Amy And Rory?
Last Weeping Angel one, honestly, but he has a time machine. Is life not simple with a time machine? If you just asked that question, ask yourself another one: have you ever watched Doctor Who? If you're still wondering, watch 'The Waters of Mars'. Watch 'Father's Day'. Watch the rest of 'The Angels of Manhattan', have your heart broken all over again, and then tell me that the Doctor hasn't thought of parking the TARDIS 50 miles away and asking to meet at a service station. Moffat himself explained that he thought the gravestone would be enough to show the audience that this was the end, but clearly it wasn't enough explanation. "Normally he could perform some surgery," Moff said, "This time too much surgery has already been performed. But imagine saying that on BBC One!" Time damages like tissue, and that's why he can't go back; he might put another dent in the 80s.