Easter egg: [Special Edition] Go to Scene Selection. In this screen (large guy with a tattoo), highlight the rubber ducky and move the cursor down. A red set of lips will appear on the tattoo. Select Enter to see outtakes from the scene that spoofs the girl on girl kiss from Cruel Intentions.
Easter egg: Go to the second page of the special features and choose the theatrical trailers option. In this screen (a spoof of the American Beauty film poster), highlight the special features option and from there move the cursor to the left or right. You will now see a belly button piercing highlighted. Click on it to see Cheryl Leigh getting proposed to by her boyfriend.
Answer: The song is called "Yoo Hoo" by Imperial Teen. The same song plays in Jawbreaker when Rose McGowan is leading her friends down the hall, which is of course, the scene that Not Another Teen Movie is mimicking.