There is a rather gross vomiting scene (seen in the commercials), a joke about donkey seeing Shrek's private parts, a «butt scratching» scene, a butt crack scene, comments about wedgies, «poop,» «extreme poop,»
gross ear wax, more vomiting, and the reappearance (and expanded role) of the transsexual (or at least transvestite) bar maid.