Even Olympic gold medalist Mary Lou Retton can't do it all -- which is the lesson kids learn in this episode that finds one of the Shop kids overextended and under-rehearsed when it's time to start practicing the gang's upcoming play. Once Shelby learns that she doesn't have to be a part of every activity to be special, she gives her role to Flip Flop Shop custodian Miss Warble, who's delighted by Shelby's kindness.