Continuity mistake: When John comes to get Dawn and they leave Sally's house, the Chihuahua isn't with them, but all of a sudden it is back with them on and off throughout the movie. (00:05:45)
Continuity mistake: In Sally's bathroom, John takes Dawn's pants and panties off. When Sally enters the bathroom, Dawn has her panties on again. (00:05:35)
Answer: It's "Love on the Rocks," performed by Johnathan Davis, who's known for being the lead singer of KoЯn. It's his cover version of Neil Diamond's song.
Bishop73