When for the second time on the fairground, and Ferry and Danielle are sitting, you can see the Cotton Candy store being closed on the background, because Danielle operates it. When the drugs start to work and they spend time on the fairground, you can see it being open again.
The movie was clearly only recorded in The Netherlands, though a large part supposedly takes place in Belgium. All cars on the camping site have Dutch license plates and only two people have Flemish accents. Furthermore, a Dutch "one way" sign can be seen on the fun fair, which looks differently in Belgium.