If you keep your eyes peeled when King Joffrey takes Sansa Stark to gaze upon the spiked head of her dead father around 12 minutes in, you’ll notice that one of the heads looks slightly familiar. The show creators David Benioff and D.B. Weiss, explained in their DVD commentary (from Season 1, episode 10) that the decapitated head is actually George Bush.
“The last head on the left is George Bush. George Bush’s head appears in a couple of beheading scenes. It’s not a choice, it’s not a political statement. We just had to use whatever head we had around.”