Other mistake: During the Vagina Monologues show, the pair of legs casts a shadow but the microphone stand doesn't. (00:00:45)
Continuity mistake: As Brian is saying "OK, you know what, fine, you are a genius", the glass of water disappears. (00:05:55)
Continuity mistake: When Tom Tucker is hit by Peter, his (Tom) left foot is facing his right knee. When the shot moves to include the hooker his left foot is now facing away from his right knee. (00:11:10)
Chosen answer: It's a real song called "Elvira". Originally by Dallas Fraizer in '66, however, this version seems to be the Oak Ridge Boys cover version. However, the mega lesbians skip the verse and just sing the chorus after the opening line.
Bishop73