Firstly, OH MY GOD. THAT FINALE. JUST. WHAT. HOLY MOTHER OF- Absolutely INCREDIBLE. I'm going to die waiting for season 4.
Secondly, I should've noticed something was up with Tyler! The scene where Caroline and him part, he tells her, "But you're strong, and you have a beautiful future ahead of you," and I thought it was strange Tyler would say something like that (since he's not one for romanticising everything). But I just brushed it off since he was dying and I figured a dying man would say beautiful things to the woman he loves.
Of course, looking back on it now it was a total Klaus thing to say! Practically the same words Klaus said to Caroline before. KUDOS on the writers for including that. Wow.
That finale.... oh wow. I can't believe Elena is a vampire. My head hurts...
AND HOLY CRAP. IF KLAUS WAS IN TYLER'S BODY... WAS TYLER IN KLAUS'S BODY? BECAUSE HIS EYES WERE MOVING. PLEASE NO. ;W; There's also the possibility Tyler is in there with Klaus (like Klaus possesing Alaric or Esther possesing Rebeka). But the reason I suggested Tyler was in Klaus's body was because his eyes were moving when Alaric stabbed him. Though there's also the chance that Bonnie spelled him so he'd transfer into Tyler's body when his was killed, as a backup plan, instead of completely swapping them. That would explain the eye moving as well.