Join host Michael Keaton to celebrate "Mister Rogers’ Neighborhood," the pioneering children's series that premiered nationally 50 years ago. Keaton worked as a stagehand and made appearances on the series in the 1970. Judd Apatow, Joyce DiDonato, Whoopi Goldberg, Chris Kratt, John Lithgow, Yo-Yo Ma and son Nicholas Ma, reveal their favorite memories from the series.