Revealing mistake: When Vic and Cora are disturbed by the workers at 5am, they put cotton wool in their ears and go back to bed. In the next shot, their hotel bedroom ceiling is removed by hand by two workers, but when Cora says "Vic! Look up there!", you can see shadows of ropes pulling the ceiling along. The ropes disappear when the camera cuts to the ceiling again.
Revealing mistake: When Pepe walks through the curtains carrying two planks of wood in the hotel lounge, he falls through a hole in the floor. When he falls through the hole, black curtains used to create darkness are visible.