According to the original script, Needy was not supposed to be seen killing the band members of Low Shoulder. The script ended with Needy retrieving the Bowie knife and riding away with the driver who picked her up. This leads to the speculation that the writer originally intended to allow viewers make predictions for themselves to what happened afterwards.
After Melody Lane catches on fire and Needy and Jennifer are outside kneeling in the parking lot it is obvious that there are no lenses in Needy's classes as there is no reflection of the fire.
Just after the fire in Needy's kitchen, Jennifer appears in profile, with a ghastly, toothy smile. In the next full-face shot, her mouth is closed, and the ghastly smile appears slowly.
Needy escapes from the isolation cell by using her new demon powers to levitate herself to a window, which she kicks out and escapes into the night. While walking down the road, she discovers the knife that the band used to sacrifice Jennifer, afterwhich they tossed it into the Devil's Kettle. Needy flags down a passing car and says that she's heading east and following a band. She adds that tonight is going to be their last performance. As the credits begin to roll, shots are shown of the members of Low Shoulder drinking and smoking dope in their hotel room. The clips gradually change into photos of the band members, dead and bloody with the sacrificial knife in the chest of one of them. In the final scene, the security camera shows Needy walking down a hotel corridor while some female fans of the band head toward their hotel room and start screaming.
Q
Why does Jennifer choose to kill Needy's boyfriend and to choose Colin as a victim only after Needy shows an interest in him?
A
Many viewers conclude that Jennifer was jealous and that she was actually 'in love' with Needy. They point to Jennifer's comment about how she and Needy used to 'play boyfriend and girlfriend' when they were children and refer to the scene where Jennifer and Needy are kissing each other. Without necessarily calling it 'lesbianism', there was indeed some measure of 'love' between the two girls, be it due to their lifelong friendship or to actual romantic feelings.