The Captain goes down below to take a rest. In multiple following shots, he is standing on deck.
When Elvispiet meets Planpiet, he's out of breath and bends. In the next shot, he is standing upright.
During the shots where the Captain is driving the steamboat, you can clearly see through the windows that it's not moving.
The shot of the Mayor calling Sinterklaas is mirrored. The paintings are turned around and the books behind him are on the left side, while in an earlier scene, they were on the right side.
Verre Vertepiet and Elvispiet look around an empty meadow and are surprised when they suddenly see Reporter Gerrit. In reality, he's only two steps away, so they should have seen him immediately.