Other mistake: Towards the end after the kids wreck the van, Kia points to a sign for Crystal Lake. That's where they are supposed to go but they go the other direction, away from Crystal Lake.
Suggested correction: They were still heading for the camp, which is where the fight takes place.
Other mistake: When the Hypnocil is shown on the Internet, the bottle says 1000 tablets. Considering they are big pills, there's no way that many could fit in the bottle.
Other mistake: When Jason is in the corn field during the rave, after Jason breaks the guys neck, the other guy burns him with a torch and the flames burns around his neck area, which should have caused him to not have any hair. But throughout the movie, his hair is still there.
Other mistake: Jason drowned in 1957 yet Stubbs says he drowned in the 1930's.
Suggested correction: Stubbs actually mentions that Jason drowned in 1957. He said it while he was talking to the teens at the table.
Other mistake: When Will and Lori get out of the Lake at the end, Lori's arm isn't burned. It's only scratched.