The colours of the t-shirts that Hielke and Sietse are wearing underneath their overalls change various times.
Kees throws his wooden shoes from the mill to climb out of the window, but when he falls down and immediately runs away from Patrolman Zwart, he's suddenly wearing them.
During the auction, when the villagers are gathering, the front door is alternately open and closed.
The Mayor is holding up the golden nugget near the end in close-up, wearing a watch. In the following mid wide shot, the watch is gone.
Jantje Bril wears two different glasses throughout the final act, one with a thick and one with a thin frame.
After Officer Blok is hit by the police car of Patrolman Zwart, he's sitting on the hood, but with the measured driving speed, it's impossible for him to end up in that position.
The shots of Patrolman Zwart driving his police car are mirrored. In close-ups, you can see him sitting on the right seat, while in wide shots he's on the left seat.
The police boat is clearly reducing speed during the chase, because the used Kameleon was an actual small pushing boat and couldn't go any faster than 15 mph.
When the Kameleon goes on a collision course with the police boat, they are clearly sailing side by side instead of straight into each other.
When Hielke and Sietse sail away from Grocer Zijlstra, the camera tripod is standing on the wharf.