|Prop head of President GW Bush,|
with medieval wig/hairdo.
What you probably didn't notice was the decapitated head of former President George W. Bush a few spikes over.
The shows creators, David Benioff and D.B. Weiss, pointed out the appearance of the presidential prop on the commentary portion of the Game of Thrones DVD.
You can see the short clip here where the image of Bush's head makes its acting debut, and you'll hear Benioff deny any political motivation for the use of the former president's likeness. Explained Benioff, with so many beheaded characters in the episode, "we had to use what heads we had around." Riiiight.