Continuity mistake: When Stuntman Mike is eating and talking to the blonde girl in the bar, he is holding a glass of club soda. When the shot reverses, he is wiping his hands, then when the shot returns, he is holding the club soda again.
Continuity mistake: During the final chase scene, as Stuntman Mike started for a while to dab the girls' car, in a scene the shadows of the cars change size between one shot and another.
Visible crew/equipment: At the end of the movie as Stuntman Mike is being chased by the girls on the highway, in a shot of him while driving, the shadow of the camera mounted on the car's door is visible on his shoulder and on the seat.
Answer: The tune is called "Twisted Nerve" by Bernard Herrmann. It sounds familiar because in one of Quentin Tarantino's earlier films "Kill Bill", Daryl Hannah's character was whistling it before attempting to murder Uma Thurman's character in her sleep.
THGhost