HBO’s ‘Harry Potter’ series has already tackled that challenge in a genuinely unusual way, building an actual functioning school on its production site rather than relying on scattered tutoring arrangements. The school built for HBO's young HARRY POTTER stars is expanding! HBO’s search for its ‘Harry Potter’ stars reportedly drew roughly 32,000 children who auditioned for lead roles following an open casting call, ultimately landing on young actors including Dominic McLaughlin as Harry Potter, Alastair Stout as Ron Weasley, and Arabella Stanton as Hermione Granger. What do you think about HBO building a full school for the Harry Potter cast? It’s a great idea — young actors should have proper education during production.