Why was Grady not at the pool party?
Here's this awesome high school party where Grady would obviously be drinking and banging away, but instead he's all tucked in for an early night. Huh? Big exams in the morning? The writers obviously needed him to be alone with Mark so he'd have a scary death, but bad plotting doing it on this night. Should have made it a random school night
(Yes, I actually stopped my day to write about this).