Other mistake: When Freddy puts his claws through Grady, not only do thy go through him, they manage to go well past the door. There is no way Freddy's claws are that long. (00:57:20)
Suggested correction: Since when can't Freddy exaggerate anything to aid his killings?
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.