Most cars do not have Dutch license plates.
While the Flodders are packing their stuff to move to Zonnedael there is a siren in the background. It cannot be from a Dutch police car or ambulance, since it is a gliding sound. Dutch police cars have 2 different tones and ambulances have 3 different tones in their sirens who are not glides.
The Flodders and all their working-class friends have accents from the Dutch Randstad area, which is known for its extremely flat landscape. Yet we clearly see some hills in Zonnedael. The architecture of the inner city is also clearly from a different region.