any theories about It Follows?

I have gone back and forth on It Follows. For awhile I loved it, and I would even say I became obsessed with it. But, after thinking it over, I have also had times when I really hated it, because of the ending, and also because I suspect that the director didn't even mean anything by the movie, he was just trying to make us all think he was very deep and philosophical by throwing all kinds of images out there that seemed symbolic of something. Lately I have been giving it a chance again.

But anyway, right now I just wanted to ask if anyone thought the blades of grass were supposed to mean anything. In the scene where Hugh is explaining everything he knows about It to Jay and her sister and their friends, Jay picks five blades of grass and lays them out, one next to another, on her leg. I was just thinking, maybe that was a little reference to Freddy Krueger's glove of knives. Just the idea of five "blades" lined up next to each other, I guess... what do you guys think? There were a lot of little references to various classic horror movies throughout the movie, of course, but I haven't seen much discussion of this particular thing.

Also, if anyone has any other theories about the movie that they would like to discuss... I'm game!