Team America: World Police Easter Egg - Trey's Head

I'm not sure if they talked about this in the commentary or not because I haven't listened to it just yet, so if it is don't think that I'm just BSing...ok... that being said.. after the intense puking scene with Gary outside the bar, when Gary is laying in his puke passed out, instead of his head, it is non other than the co-creator Trey Parker's head in place of Gary's