Continuity mistake: When Ginger and Brigitte are talking about their suicide pact in the first scene, Ginger puts her hand out and says "Out by sixteen or dead on the scene " When she first reaches her hand out, it's flat with her palm facing up and her fingers pointed out. It then cuts to the opposite angle, instantly she is holding her hand with her palm facing out and her fingers pointed up.
Continuity mistake: In the opening scene, from the moment the little boy wipes the blood on his face to the last time we see him (when the mom is crying about how "It got our dog!"), the amount of blood on his face changes at least twice. Sometimes there is more or less depending on the shot.
Continuity mistake: In the scene where Jason has hold of the little boy in the Halloween costume, the hat on the boy's head disappears between shots, just before Jason releases him.
Continuity mistake: When Ginger and Pamela are talking about why Ginger's back is hurting, the bread Ginger is eating and the hand she's holding it in changes repeatedly throughout the scene.
