- The film uses a lot of dialect, and eventually had to be subtitled when it was released in the United States.
- The film was inspired by the 1995 assassination of veterinary inspector Karl van Noopen.
- The film was shot in Flanders, Belgium, where the director himself grew up.
- The film is director Michael R. Roscam's big-screen debut.
- Matthias Schoenaerts has endured 2 years of physical training in order to play the role of muscular Jack, gaining 27 kilograms, and really turned himself into a muscular man. In addition to this, he and the other actors also learned the local dialect of Flanders.
Rundskop behind the scenes gags
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Narrator: Sometimes in a man's life stuff happens that makes everyone go quiet. So quiet that no one even dares talk about it. Not to anyone, not even to themselves. Not in their head and not out loud. Not a fucking word. Cos everything has somehow got stuck. There, deep in the fields, under the trees and the leaves, year after year. Then, suddenly it all comes back. Just like that, from one day to the next. No matter how long ago it was, there will always be someone to bring it all back. Because no matter what you do or think, one thing is for sure. You're always fucked. Now, tomorrow, next week or next year, until the end of time. Fucked.
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Charles Richter: Go on, those Walloons don't understand a fuckin' word we say.