Continuity mistake: Kim is at the kitchen table with her brother Alex. Kim has a necklace on. Kim asks Alex about having a date for the prom and all that is around her neck is a gold chain. The shot then cuts to Alex and then back to Kim and now there is a gold star hanging from her necklace.
Continuity mistake: When Robin lays there after she dies her head's facing forward, a shot later her head's turned to her left.
Chosen answer: The girl in the van was Jude. She was involved in Robin's death. You see her flashback as young Jude when she receives her prank phone call then she meets Slick walking on her way to school.