While that role was primarily occupied by Oberyn's daughters in the books, the person you see arguing with Doran that Myrcella should be killed is actually Oberyn's paramour, not his daughter ;)

Heard someone refer to that roadside inn as the "King's Road Denny's" since Sansa & Littlefinger are actually sitting in a booth. Here's to hoping they find more franchising opportunities down the way.