I watched the post-show discussion (on HBO, right after the episode), and they said that the audience should have expected everything to go south if they were followers of GOT/GRRM. Shit hits the fan at all of his big weddings.
Some interesting characters to watch going forward.
Lord Lyonel Strong: New Hand of the King
Sir Harwin Strong: Lyonel's son. He is the big dude who took charge and broke up the brawl at the wedding
Larys Strong: Lyonel's club footed son. He is going to be a lot like a combination of Varys and Littlefinger. He will use his lameness/weakness to appear to be non-threatening (like Varys did with being a eunuch), and get information that his father/brother can not get due to being perceived as threats. As we saw last night, he is also cunning and manipulative when it comes to what to do with information (like Littlefinger).