Howling:Regeneration limit?

Moffat said that one of his old friends was supposed to give a nod to the regeneration limit. Did anyone see anything of the sort in the entire series? Could it have been edited out? The only thing I can think of is this. It was the Dream Lord. If he was the Valeyard, then that would mean that the Tenth's aborted regeneration counted, and Smith's regeneration will be his twelfth. This would explain how the Dream Lord was created in the first place. Does anyone have any other ideas, or know? The Thirteenth Doctor 23:18, June 27, 2010 (UTC)