Guest Stars Dominic MacHale as Sergeant Healy Demi Isaac Oviawe as Linda Walsh Jennifer Barry as Siobhan Walsh P.J. Gallagher as Principal Barry Walsh Orla Fitzgerald as Orla Walsh Chris Kent as Conor's Dad Emma Willis as Jeanette Patricia Twomey as Mrs. McCarthy Ronan Burke as Seany Eimear Powell as Kissing Girl Sinéad McGee as Kissing Girl #2 Chloe O'Reilly as Dicey Dearbhla Lorcan O'Neill as Builder Margaret Donovan as Girl in Park