When Cartman is in the bull riding contest, he's in his Ming Lee persona, and the announcers and crowd refer to him as such. But the scoreboard still says "Eric Cartman."
The Line Ride should have cost seven tickets at the end, not five.
When Stan and Kyle get the Terrance and Phillip dolls, Stan can be seen holding two Phillip dolls. However, immediately after, Stan can be seen holding both Terrance and Phillip.
The Phillip dolls should come with blond hair, not black. However, as was stated, the dolls are cheap ripoffs so the wrong hair color could have been part of that.