They said on the news that they had to clean his face up a bit before they could take a pic suitable for public viewing.
Oh, ok.
It is likely they had to reattach his face so Iraqis might have a chance of recognizing him as dead, as we did with Uday and Qusay. Otherwise, a conspiratorial culture (e.g., DU) would claim Zarqawi was not killed and still lived to provide inspiration.