How Trey Parker and Matt Stone made South Park a success:
You won’t find “Simpsons” creator Matt Groening tearing apart his show at the last minute. That show’s writers labor over scripts and then send them off to be animated in South Korea. The entire process, typical of modern animation, takes eight months.Parker and Stone, however, produce each of their shows in a week. They start Thursday morning with a writers’ meeting and finish the following Wednesday, when they send the show to Comedy Central via satellite uplink hours before it airs at 10 P.M.
I guess that explains how they stay so timely.