Brie Larson Knew Woody Harrelson Was Right for 'The Glass Castle' After They Got Trapped in a Thunderstorm In The Glass Castle, Woody Harrelson plays a man constantly living on the edge. His Rex Walls is an alcoholic father with good intentions but untraditional, even dangerous, parenting methods. In the film, Destin Daniel Cretton’s adaptation of Jeanette Walls’ New York Times best-selling memoir of the same name, Brie Larson portrays the adult version of the author as she reflects on her tumultuous childhood and complicated relationship with her father, Rex.