Three questions about Harry Potter series?

Has any other Harry Potter readers have these questions answered? 1. When Profressor Slughorn called Ron "Rupert", was that done deliberatly because of the actor who plays Ron's name? 2.Why doesn't Harry see the threstels that pull the carriages at the end of "The Goblet of Fire"? 3, Were Snape's last words to Harry("look at me") because he wanted to Lily's eyes before he died? 4, Harry's son Albus Severus Potter's intials are A.S.P. Was that on purpose or coincidence?