Strong messages about the value of friendship and that facing your fears is a positive thing. Also, you can do the right thing and still succeed. Themes include courage, compassion, and integrity.
Comic peril, cartoon violence. The monsters are terrified of children for most of the film, which takes out some of the scariness. In the scariest climactic scene, the villain monster straps a toddler to a chair to catch her screams in a machine, and she appears very frightened. Her monster friend saves her.
Some flirting and discussion of dating.
This movie is part of the Disney-Pixar dynasty, with plenty of merchandise associated with the film. Toy Story toys are on the floor in one child's room.