Evan Rachel Wood broke the capillaries around her eyes while filming an intensely emotional scene.
Elliot Page was inspired to make the film after coming across the book written by Jean Hegland while browsing through a small store in their native Halifax. It was suggested to them by the woman working there and after they read it, they decided to produce a movie-version of the story.
Elliot and Evan spent a great deal of time together to make their onscreen sibling relationship seem authentic. However, Elliot explained that it wasn't just method-acting, they genuinely experienced a deep and unique connection.
Although Elliot Page had not met Evan Rachel Wood prior to casting her in this movie, Max Minghella has been a long time friend of Elliot's and had worked with Evan a few years prior in Ides of March. The three bonded during filming.
Elliot Page is 6 1/2 months older than the actress, Evan Rachel Wood, who played their older sister. Though they both played teenagers in the film, at the date of release they were 29 and 28, respectively.