A special documentary filmed during the production of HBO's Harry Potter adaptation has revealed behind-the-scenes insights into the creation of the series' first season. Released on April 5, the 30-minute special titled "Finding Harry: The Craft Behind the Magic" invited viewers into the creative process of the season being filmed at Warner Bros. Studios Leavesden in England. Accompanied by narration from director Nick Frost, the documentary covered a wide range of topics, from the details of this extensive production to the casting process, the animatronics designed for the creatures, and costume designs dating back to 1991.

The production team revealed that they managed over 40,000 auditions to find the roles of Harry, Ron, and Hermione, and admitted they struggled to keep track of the numbers. Casting directors Emily Brockmann and Lucy Bevan noted that all children across the UK had the opportunity to apply online, followed by in-person interviews held in Manchester, Scotland, Ireland, and Cardiff. Alastair Stout (Ron Weasley) showcased his acting in Manchester, Arabella Stanton (Hermione Granger) in London, and Dominic McLaughlin (Harry Potter) in Glasgow.

Dominic McLaughlin immediately impressed the directors with his "quiet confidence" by presenting a poem he wrote about his weekend diary. Lucy Bevan summarized the qualities sought in the casting process: "They are skeptical of the adult world. There is vulnerability, sadness, and loneliness within. What you fundamentally need is: a 10-year-old extraordinarily talented child actor."

Arabella Stanton was praised by the selection committee for showcasing another side of her acting with a comedic scene after reading the poem "Invictus." Emily Brockmann addressed the challenges of casting, stating, "This role means a lot to many people. You are looking for a child who seems ordinary on the surface but is actually very extraordinary." Given the cultural significance and legacy of Harry Potter, the meticulousness of this selection process is entirely justified.