Seems some Americans think he went a bit too far with some of his jokes. I watched some clips before work this morning and thought it was very funny.
To be fair to him, he did say that he was going to make sure they didn't invite him back, so what did they expect?
Some were mystified as to why he wasn't seen on screen for about an hour, some saying he returned after that hour with a tamer performance as a result of a possible wrist slapping.
I guess we'll find out what happened backstage when he appears on Piers Morgan's new show, or on his blog.