While Nina is texting Tyler in the hot tub, she picks up her phone upside down; can see the headphone jack is and where the charger goes. When the camera changes to it showing an extreme close up, it's held upright. See more
Gotta remember that the whodunit may not be as important in our story... You need to figure that it's a horror story, that someone might die at every turn. You have to care if the smokin' hot lit teacher seems a little too interested in his female students. You have to care if the team wins the big game. You have to care if the smart, pretty girl forgives the dumb jock.
Sounds like Friday Night Lights
Exactly. You root for them, you love them, so when they are brutally murdered, it hurts.