6 Days to Air: The Making of South Park
Starring Trey Parker, Matt Stone, Bill Hader, Anne Garefino, Frank C. Agnone II, Vernon Chatman, Susan Hurwitz Arneson, Eric Stough, Adrien Beard, Jack Shih
It's a documentary and comedy movie, and has a rating of 7.7 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from Belgium.