Factual error: If you cover someone's mouth with a 2-3 inch strip of duct tape, or electricians tape, rather than go around the entire head, it is VERY VERY easy to repeated open your mouth wide, then scrunch face over and over again and work the tape off to the point where you can scream. Actually, duct tape, which is used by most of the offending movies is even easier than that. It can usually be almost completely removed in a matter of seconds. Electricians tape as used in this movie, is a little harder since it is stickier, by still can be done fairly easily. I suppose that it can be argued that people in these situations are scared, or don't know any better and therefore don't TRY to remove it. But in this movie, the main character is getting her stomach cut open and screaming in intense pain. This would cause enough facial movement for the tape to work itself free.
Plot hole: In one gruesome scene, the killer hangs Natalie's friend in the woods and then crashes a car into a tree. Natalie escapes and comes back with campus security (who didn't bother to call the police even though a murder had just been committed). When Natalie and the guard get to the murder scene, all evidence is gone. How did the killer manage to remove the body and all pieces of the car within ten minutes (not to mention somehow hide the dent left in the tree by the car crash)?
Plot hole: When Natalie and Damon are in the woods when Damon goes to the bathroom and the killer approaches him from the behind, it cuts to the scene with Natalie in the car. Then she gets out and sees the killer then runs to the car. You see the killer put rope on the car but how does the killer hang Damon without Natalie noticing?
Continuity mistake: When Natalie is in the car, she is unaware that tied to the back is rope which is also hanging Damon from the tree. When she reverses, this causes him to crash into the windshield. However between shots the way he is falling and the way he lands is inconsistent. (00:29:55)Hamster
Plot hole: When the girl in the car gets killed she is decapitated with an axe. All you see is her noticing someone in the back of the car then a shot of an axe coming through the driver's seat window. How did the killer manage to swing an axe in a car and take off someone's head whilst he was sitting right behind her?