Talk:Lesson Zero/@comment-1034487-20111018023342/@comment-6808267-20111018165329

There is no official authority that rates programs. The TV Parental Guidelines rating is mandatory for most programming in the United States, but the networks, producers, and possibly the programming guides decide the rating for themselves. There's no official rating authority like there is for movie ratings.

Because of that, it's possible that two different entities could rate a television show different.

Technically TV-Y is not supposed to contain any violence at all. Not even cartoon, fantasy, or comedy violence. TV-Y also is not supposed to contain any scenes that would frighten children under 7. Altough Lesson Zero was rated TV-Y according to the rating banner at the beginning of the show, it probably should have been rated TV-Y7. TV-Y7 can include mild fantasy violence, comedy violence, and themes or scenes that might frighten younger children.