Westworld creators Lisa Joy and Jonathan Nolan are not only friends with Game of Thrones creators David Benioff and D.B. Weiss, but "we’re also friendly with George R.R. Martin, and George had consistently since the first season said, 'We’ve got to do a tie-in with Game of Thrones,'" says Nolan. "People forget that George was originally a TV writer and he came up in the TV world in which you’d occasionally have these crossover shows, which the fans would f*cking freak out over. So George had always been pitching the crossover show." Nolan and Joy add that they Benioff and Weiss' cameo on Sunday's episode was a response to the way the Game of Thrones showrunners treated them. "Those guys are the f*cking nicest guys in the world," said Nolan. "Usually when you come into a network where there’s a big dog show — and we’ve been in that position before — without naming names, there’s been (a vibe of), 'We’re not inclined to be friendly to you if you’re the new kid on the block.' We came to HBO with a big ambitious show at a point in which their show was and is the biggest f*cking thing that’s ever been on TV. And they were so welcoming and so kind to us at a moment in which we were struggling through a first season and trying to figure out how it will work. We’ve remained friends." Nolan and Joy say the cameos were also a way to pay homage "to the show that created the opportunity for us to do this show."