The fake trailers and the Booty Sweat ads ARE part of the movie. It just threw off people in the theaters who thought they were "real" trailers. There were 3 college age girls next to me in the theater and when the preview for the Jeff Portnoy movie came on, they said to each other, "I never heard of Jeff Portnoy, who's he?" I almost spit up my soda. Then when the movie started and they saw Jack Black they said, "ohhhh that was Jack Black". Two of them were blonde! :) Great movie!
When the Booty Juice and Bust a Nut Bar commercial came up, I was watching full blast on my portable DVD player with my 2 year old daughter. Need-less-to-say, I quickly lowered the volume. Halarious stuff.