Karen Gillan and the cast of Netflix’s chaotic new comedy ‘The Bubble’ discover who learned to roller skate over the past two years and who’s secretly been a musician their entire life. The rest of the bubble’s residents, including Leslie Mann, Maria Bakalova, Iris Apatow, Samson Kayo, Harry Trevaldwyn, and writer-director Judd Apatow, reveal who the set’s best dancer and best eater were and tell stories about two obscure hair-care ordeals.