Sunday night's "The Rains of Castamere" episode of Game of Thrones left many fans in an utter state of shock and disbelief. HBO has released two featurettes, one on the penultimate hour as a whole, and another on "The Red Wedding" that took place. Be warned, if you are not caught up with Season 3 yet, there are huge spoilers within. Learn more about this pivotal episode before the Season 3 finale, "Mhysa", airs Sunday, June 9 at 9 PM ET on HBO.