Plot hole: When the sheriff and his deputy find the remains of Roy this is just a few yards away from Darren and Lizbeth's car. It's hard to believe that none of the five people in the paintball game came across the car or the bodies while they were all walking around.
Plot hole: After Jason is "shocked" back to life, Tommy gets into his grave and is trying to get the metal pole out of Jason. During this time, Jason is looking directly at Tommy while he's trying to get the pole out. And Tommy looks right at Jason a couple times, so he should know he's alive, But Tommy doesn't realize he's alive until he grabs him from behind.