A man falls to his death off a building as result of a freak accident on a construction job. We later see his corpse in the E.R., though he comes back to life in later part.
A kid abuses an alien creature multiple times after it doesn't give him what he wants. We see him submerge its head in in a toilet, possibly intending to drown it or "teach it a lesson" and then he violently throws it into the trash, hitting it with a banana and saying he wants to stab it to death.
Later, the father, thinking the creature is a toy, stretches it, slams a trash can lid on it, and throws it to the ceiling. Children who are fond of animals may find the abuse scene and the scene with the father very upsetting.
A group of children chase the creature trying to catch it with several near misses, and then catch it and twist it. Then, two children are shown with tools such as a saw and an electric drill, trying to open up the creature. The creature is not shown during the scene -- only the children hovering over it -- but it can be upsetting to children that imagine the creature as a pet.
A kid is bullied throughout the film
A fat girl and a group of bullies fight each other in one scene, this scene is over exaggerated and is not meant to be taken seriously.