Main message seems to be to remember to take your cell phone if you're going to be poking around in a dark, creepy place.
Gory dead bodies. Blood stains/smears. A character is stabbed in a swimming pool; blood swirls everywhere in the water. Stabbing/slicing with knives and an awl. Guns and shooting. Attacking with an ax. Smacking with golf club/baseball bat. Teen girl wounded, crying in pain. Character impaled with a wooden beam. Bloody wounds. Car crashes. Explosion. Jump scares.
Brief sex talk between a married couple.
Several uses of "f--k," "s--t," "bitch," "d--k," "queef," etc., by both adults and teens. Middle-finger gesture from teen.
A teen girl smokes cigarettes. Adults drink wine from the bottle. Teens discuss whether to try shots of whiskey (they don't). Mention of an adult who "smelled like beer."