The werewolves can be very fierce.

Nothing.

This film may be a bit darker than the first.

The werewolves can be frightening to children.

After a pep rally practice, Zed and Addison argue about the werewolves, and get really angry. This can be frightening and upsetting. In my opinion I'd say: Don't ever make Addison angry. You wouldn't like it when she's angry.

The song "Gotta find where I belong" can be sad.

Zed threatens to remove the device that keeps him from eating brains thinking that the werewolves have kidnapped Addison.

If it was rated by the MPA, it probably would be rated PG for action, mild violence, mild language, and some rude humor