Other mistake: Jack glances at the front of the baseball card the Consul gives him, and he says "Hap Ashby, 1963 Angels." He has no idea who that guy from 200 years before is, but the card does not say the year, and he's not a psychic. (00:15:55)
Other mistake: After Wendy reads the fake note she wrote from 'Snookie' to 'Bubbles' she tells the guys that it's really Peewee who is being set up to meet at the motel with Ballbreaker (Bubbles). Yet it's Tommy who shows up at the door.
Suggested correction: That's because Tommy conned PeeWee into giving him the candy and flowers, then sent him back to his room for something else in place of those. Then he ran of, got into his vehicle, and sped away. That's why when PeeWee showed up, and they asked who was in the room, he said "Tommy" as he realised Tommy duped him.
Other mistake: If Freddy ripped his scalp off, it would be his skull, not his bare brain. It's not like he pulled both of them off at once. Freddy's got a skull, as we saw when Tina took his face off in the first film, so why is the top of it missing in this one?
Suggested correction: This scene takes place within Jesse's nightmare, which is Freddy's domain, so Freddy can manipulate any detail he wants, in this case, exposing his brain without cutting open his skull.
Other mistake: When Sonja is being raped, modern fillings are visible on her teeth.
Other mistake: As the spear mounted on the bucket of the loader passes through the wall, it passes over the body on the bunk. Unless it was a dead body or a dummy, the man should have reacted.