Factual error: Jeff, being a medical student doesn't really seem to know how to make sure infection doesn't occur. In the scenes where he is cutting out parts of plant from Stacy's body he pours alcohol on her body before cutting it. This is totally useless as he doesn't put alcohol on his hands, the knife or inside the open wound after he cuts it. Infection as almost certain to happen because of this. This is practically impossible to not know by a medical student.