At about ten minutes from the end, the van is shown with a broad, even band of smeared blood across the front. Immediately afterward we see an earlier version with significantly less blood.
Tony the receiver is wearing a jersey with number 52. When Becky and Seth are being attacked in the science lab by a zemon they call Josh, this zemon is also wearing a jersey with number 52.
Our young heroes attend college, yet the cheerleaders are wearing uniforms with embroidered initials that end with "HS".