By Rene Rodriguez

McClatchy Newspapers

Ten years in the making, Trey Parker and Matt Stone have finally made good on their promise to record a commentary track for "South Park: Bigger, Longer and Uncut." The only catch is that the track is exclusive to the new Blu-ray release of the film (Paramount Home Entertainment, $30), and the movie's crude animation doesn't benefit much from the format's higher resolution.

Unusually straightforward and honest, the normally irreverent duo begin by admitting they don't remember a lot of details about the making of the 1999 film. But they still come up with enough anecdotes to make the track live up to expectations.

Although the idea for the movie was making "an R-rated cartoon about an R-rated cartoon," Parker and Stone admit they received enormous pressure from the studio to deliver a PG-13 picture and were even forced to sit through a presentation by accountants explaining how much more money they stood to make if they softened the film.

The duo also reveals the studio hated their decision to turn the movie into a musical, and marketing executives hid the fact from the film's trailers and marketing materials. Only after one of the songs was nominated for an Oscar ("Blame Canada") did Paramount ever concede the musical idea was a good one.

Parker and Stone recount the Oscar nomination experience extensively, including their decision to wear dresses to the Academy Awards (they almost chickened out at the last minute). Eventually, the duo invites members of the "South Park" staff into the recording booth with them to help jog their memories.

But the stories never stop coming, whether it's Metallica's James Hetfield agreeing to sing the song that is heard when Kenny goes to hell (but asking for his name to be kept off the credits), or Paramount's accounting practices, which claim the film is still $40-$50 million in the red (even though it only cost $20 million and grossed $60 million), so they've never received a single royalty check from it. As for the movie, "South Park: Bigger Longer and Uncut" remains hilarious and astonishingly daring, even for people who aren't fans. For an added kick, try watching it with Spanish subtitles.