Day-Lewis became interested in the project when he read the opening scene, which features him, as Brown, using his left foot to place a phonograph record on a player and then placing a needle onto it so that it will play.[10] He said of the scene: "I knew it couldn't be done... and that intrigued me."[10] Many scenes were filmed through a mirror, as he could only manipulate his right foot to perform the actions seen in the film. He spent some time preparing for the film at Brown's alma mater in Dublin. He later returned there for a visit, with his Academy Award.[11]
Day-Lewis was known for his extreme method acting, and insisted on staying in character during the production of the film, refusing to do anything that Brown could not do. This meant that members of the film crew had to move the actor around in a wheelchair, lift him over obstacles, and even feed him.[12][13][14]
