Outi Mäenpää originally had no intention to actually take part in filming and attended the casting session just to meet Pernilla August in person. Mäenpää did not want to participate since she was going to get married around the time when the filming was supposed to begin. Eventually her wedding date was not changed, but the filming started a bit later.
Tehilla Blad and Junior Blad plays siblings in the film and are siblings in real life. Mid sister Alpha Blad is also in the film as the main character Leena's (Noomi Rapace/Tehilla Blad) child Marja.
Tehilla Blad, who plays the younger version of Noomi Rapace's character Leena in this film, also played the younger version of Noomi Rapace's character Lisbeth Salander in The Girl with the Dragon Tattoo (2009), The Girl Who Played with Fire(2009), and The Girl Who Kicked the Hornet's Nest (2009).
Sweden's official submission to the Best Foreign Language Film category of the 84th Academy Awards 2012.