I actually clapped when Oberyn offered to be Tyrion's champion, this makes me very happy. And I just can't help it, I love Bronn.
I was very surprised Littlefinger killed Lyssa so soon and I hope they fly that kid, too, 'cause you know he's never going to change. We really don't need another Joffrey.
As for Sansa, well, I do think she'll fall for Littlefinger's bullshit. He's not really lying, getting revenge for Cat being killed is certainly one of his reasons for killing Joffrey. And besides, Sansa is not too bright.