Revealing mistake: When the drug "Hypnocil" is researched on the Internet, an article about the drug appears. If you pause the shot and read the article, you can see that it has nothing to do about Hypnocil. The article is about drug testing of students who engage in extracurricular activities.
Revealing mistake: As soon as the drunk kid sets Jason on fire there's a few quick shots of Jason's face but there's a perfect hole right through his head where his eye is supposed to be and you can see the night sky through it. Some people say it's a reflection off the goggles to protect the actor from the flames. Either way it's a mistake.