The characters here seem like badly-behaved college students, going away for a weekend of drinking, sex, and partying. They blunder into the wrong place at the wrong time and pay dearly. There are no warnings or moral decisions involved; what happens is just pure bad luck.
In 1983, this movie set a new standard for blood and gore, although movies since then have gone much further. Perhaps the most disturbing scene is the one in which the animated branches of a tree "rape" a woman. There are scary demons (with scary, screeching voices), as well as screaming, stabbing, scratching, fighting, bashing, biting, burning, severed limbs, spraying and/or gushing blood, and the spewing of some unknown white stuff. The hero, Ash, slaps his possessed girlfriend, straps her down to a workbench, and attempts to cut her up with a chainsaw (he can't go through with it). Ash uses a shotgun on the demons and also gouges out some eyes. In the end, the demons' faces melt. All of this stuff is presented in a very goofy, deadpan, tongue-in-cheek manner.
There are two college-age couples in a cabin, and so there's kissing, and characters thinking about sex. There is some partial, brief nudity (breasts). There's also the aforementioned "rape" by a possessed tree. (A tree branch thrusts itself under a girl's dress, between her legs.)
We hear "hell" twice, several uses of "God" and "Jesus Christ," plus "bastard" and "turd."
Drinking, Drugs & Smoking
The college students drink something from a jar while driving, and then some wine at dinner before all the trouble starts.