Christoffer Nordenrot, who plays Alex, lost 20kg (45lb) in three months in order to look like he was 16 years old. After four weeks of shooting he had three more months to gain weight and build muscles to portray the 12 years older version of Alex.
This movie was part-funded by fans on Kickstarter. The goal was 300 000 SEK (35 000 USD) and they reached that in less than 24 hours. When the month passed they reached 788 000 SEK (91 000 USD). It's the biggest crowd funded feature in Sweden.
In order to capture good quality dialogue on set, the boom operator was most of the time allowed to be in frame and was later removed in post production.
Jesper Barkselius (Björn Stenberg) did all of his stunts, fights and body burns by himself. He also flew the airplane for real.
The scene with the yellow Saab getting crashed from behind was the first action scene to be shot. The cinematographer was so nervous getting the shot right that he forgot to press record. If you look closely in the movie you can see that the Saab is already smashed before it's hit by the blue car.