Trouble In South Park Land?

The latest episode of South Park, "Fishsticks," took on Kanye West and Carlos Mencia. But the central plot had Cartman trying to take credit for a joke that Jimmy actually wrote. All Cartman had to do was lie on the couch while Jimmy did the work. Yet, in Cartman's mind, it was all him.

The show regularly takes on issues of the day. I wonder, is there some trouble with the relationship of Trey Parker and Matt Stone?