Fridge Horror: Is Dr. Crews denying the idea of Tina having visions of the future because he's skeptic, or is he doing it to further break her down so he can control her more easily by convincing her and her mom that she's just crazy?
Moral Event Horizon: Dr. Crews had already proven himself to be a bastard long before, but he went right over this the second he forced Tina's mother to take a killing blow from Jason in order to protect himself.
Every single moment of Lar Park Lincoln's performance as Tina.
Considering the things thrown at his way in the previous films, Jason flipping his shit at the sight of Tina's powers doing their thing should be very silly. But it works because it helps to sell her as a threat against him.
Older Than They Think: The infamous sleeping bag murder is very similar to one of the kills in the 1980 film Night of the Demon.