The wet spots on the deck when Marcel suppose to clean them and starts dancing with the water-hose keep switching from dry to wet from shot to shot.
When the big truck, in which Marcel sneaked in was locked and moved to the ship, his blue shirt was visible partly from the outside. Later on the ship when he had to sneeze his shirt was not visible anymore.
During the dance performance Bas is not seeing wearing his captain hat and when he comes out with Vishers on the deck he doesn't wear it either. But in the final shots he and Vishers are seeing playing with it, despite it wasn't there earlier.