did you read the Synopsis
Sofie is an innocent 13 year old preparing to start junior high. Together with her two best friends she is making plans for her fabulous new grown up life - she wants to accelerate her education and growth and go to all the parties and get to know all the cute boys at school and maybe find a boyfriend.
http://ketchupeffect.com/synopsis.htm
are they trying to say that the actors are implied underage in this video?