Aparently it was just lying around?
It’s George Bush. A prop of his head was used in one one of “Game of Thrones” beheading scenes. The creators mentioned on the DVD commentary “George Bush’s head appears in a couple of beheading scenes,” the duo revealed in their commentary. “It’s not a choice, it’s not a political statement. We just had to use whatever heads we had lying around.”
They just had heads lying around? I suppose this is the true difference between TV and HBO.