Audio problem: When Cher and Tai are at the party and Travis comes up to them he has 2 cups of some kind of drink and all of a sudden you hear a sound that is supposed to be something spilling. I guess they assumed that it was supposed to be the beer spilling on Cher's shoes. Well as you can see nothing falls/spills from the cup, it is just sound effects.
Audio problem: When Nomi is dancing at the Crave Club with the bouncer, she kicks him for making a suggestive comment and the bouncer stumbles backward into another guy on the dance floor. The bouncer tells the guy to "be cool", and the guy responds with "you be cool, buddy", but as we hear him say this, he's already punching the bouncer and his lips aren't moving along with the words. (00:17:35)
Audio problem: At the beginning of the movie when the employees start singing after Mark puts his song on, Renee Zellweger is supposed to be singing while she wipes the CDs but you hear her singing and her mouth is not even moving.