In the final battle, Will is swinging the fisherman's hook at Julie but hitting nothing but air. Yet the hook still makes the overused Hollywood "metal on metal" sound despite it not coming in contract with ANYTHING.
When Julie and Helen are looking at David Egan's obituary, it mentions that he was 28 when he died. But when they go to see David's sister, she says that he was Class of '92 at the high school. So that would make him 23 when he graduated.
Helen's father's store is called Shiver's. This is grammatically incorrect, as it should either be called Shivers as it is the name of the family, or Shivers' or Shivers's to indicate that it is owned by the family. It being called Shiver's implies that the family's last name is Shiver.