It was because of the criticism this film recieved in Denmark that Nicolas Winding Refn decided to stop making films there.
After finish this film Ilyas Agac went to jail and Nicolas Winding Refn had to take the film to him in jail so he could see the final product.
Just like Pusher (1996) and Pusher II - Du sang sur les mains (2004), all the scenes were shot in order.
The people at the NA-meetings are real drug-addicts.