Like the book, the movie exalts the human virtues of survival, teamwork, hope, and love -- things that the aliens see as weaknesses but that the humans (and at least one Other) know are the driving forces of humanity.
People die or are injured from bullet wounds, natural disasters, explosions, and a killer virus that infects the majority of the world's people. The government enlists child soldiers to kill the enemy; at least one of them dies. Cassie kills someone she thinks has a weapon, but it turns out to be a cross. Fist fights and hand-to-hand combat. Some scenes show an entire field of body bags or dead bodies on side of the road, in front of houses, etc. Cassie's gunshot wound is bloody and requires suturing. She bleeds a lot and passes out (off camera).
Main characters start kissing and lie down in a car, but there's no evidence they do more than kiss. Several scenes of teens staring at other teens' bodies (including one of guys looking at a girl's backside and another of a girl gazing at a guy bathing in a river -- his shirtless chest is visible).
One "f--king" (exclamation) and a few uses of "s--t," "bulls--t," "ass," "dumbass," "Jesus!," "stupid," etc.
Sony phone, computer, Dodge, Colt 45 handgun, ABC, CNN.
Drinking, Drugs & Smoking
In the opening scene, Cassie's at a high-school party where everyone seems to be drinking beer.