When season 2 premiered, it cam back with 3.9 million viewers. That is a 74% increase from season 1’s premier. The second episode had 3.8 million viewers. Having that little drop off after a season opener is nearly unheard of.
Here is what HBO’s director of Programming, Michael Lombardo had to say about the renewal:
“Series creators David Benioff and D.B. Weiss raised our expectations for the second season – and then surpassed them.”