Visible crew/equipment: In the Paris opening, lighting reflections are visible in the windows, and on the roofs and bonnets of the cars.
Visible crew/equipment: In the "I'm So Ronery" song, the camera pans past some photos of celebrities. Look in the Marilyn Monroe photo and you can see crewmember's feet (could be a puppeteer?).
Visible crew/equipment: Right after Kim Jong Il finishes his "Ronery" song, the camera pans out to reveal him standing on the balcony of his palace. In the first of these 3 shots, if you look on the wall to the left as the camera pans out, you can see a brief shadow of the camera moving backwards.
Visible crew/equipment: When Carson shows the engagement ring, you see Carson's arm doesn't move when a real hand pops up.
Answer: I read an interview with Trey Parker and Matt Stone where they said that they had not intended for it to be that way but that when they made the Matt Damon puppet, it looked so retarded that they thought it would be funny to just have him be retarded in the movie and only say his name. They said it was nothing personal against Matt Damon.