While not disturbing, but there's a scene in the episode "Interview with a Campfire", where we meet Bean Mattson, where in the finale he floats in the air and says "Don't ever got a brain or nothing", I don't know what it means, but mostly will scare young children.
In one episode Suzie encounters a talent scout who wants to recruit her for a record label and asks for a payment of $1000 to cover use of a recording studio however when she arrives at the studio she finds that the building is vacant and the "talent scout " was a con artist. Her sister who loaned her the money then tells her that what happened could have been worse.(implying things like kidnapping)
Some episodes focus on topics that pre teens face like struggling to fit in, going through puberty, unrequited love and the consequences of rebellious behavior.
None.