Some kissing.

There are several scenes of mild fantasy violence, including kicks, punches, and a couple of headbutts, but there is never any discernible amount of blood or injury detail. A character is also stabbed in the chest with brief sight of blood visible on the end of the blade.

Battles, while not particularly bloody, are intense and relentless. Combatants are skewered by blades, pounded by hammers (sometimes vanishing into dust under the assault), frozen and crushed. Folks fall off the sides of cliffs. Others apparently vanish into the vacuum of space. One massive, robot-like guardian blasts fire out of his visor, causing much mayhem. Combatants are thrown through the air and contract frostbite (a side effect of a frost giant's touch).

Thor, naturally, inflicts his share of damage, and even without his hammer he's a force to be reckoned with. He beats up several guards while trying to reclaim his weapon of choice and roughs up about a dozen doctors, orderlies and police officers who are trying to care for him. While battling a huge beast, he turns himself into a human bulletrocketing into the monster's mouth and exiting through the back of its head, leaving behind a gaping wound.

Jane accidentally hits Thor twice with her SUV (once so hard that a window breaks). Darcy tasers the guy. And he's ultimately hit so hard by a gigantic, inhuman soldier that the blow appears to kill him.

Elsewhere, there are loads of ear-rattling explosions. Things crash violently to the ground, and several vicious storms are conjured. A resident of Asgard is nearly murdered in his sleep. Odin injures his eye in battle. (We see the bloody wound.) Thor tips over a banquet table, and he smashes a coffee cup in appreciation.

At the climax, Loki attempts to commit genocide on the whole Frost Giant race, which Thor charges in to avert.

Alcohol consumption, and Thor gets injected with a sedative.

There are moments of mild threat when fantastical villains appear; whilst these scenes are not sustained, the characters are potentially scary and a bit intimidating.

The scenes with car accidents and the hero being struck by a car might also be upsetting.

Overall, most of the violence is fantastical and against nonhuman enemies, but the fight scenes that take place on Earth and some of the cars crashing might be upsetting in a real-world way.