The director (a big RAFC supporter) insisted that actor Gene Bervoets (a Beerschot supporter) whistle the anthem of RAFC in a scene where he's in the car (Beerschot and RAFC are both football clubs in Antwerpen, with 100 years of enmity dividing their fans). Gene Bervoets, however, agreed to do as requested immediately. Since his character is a complete bastard, he thought it quite logical that he would be an RAFC-fan.
In the first scene in the café, Bieke en Vincke are watching an episode of "Buiten de Zone" (season 2, episode 2: "Kitsch en Kunst"), a highly popular youth series in the 1990s. The actor who plays Bieke's father in the movie, Dirk Roofthooft, appeared several times in this series.