Little inaccuracies make them dangerous. I am one of those that think tutorials should be perfect. Without acrimony, don't get me wrong. A stone gives less, as we say by this land but poor people witch takes your lessons literally.

For example: You consecutively compile the map twice. Simple map compilation includes entities too. You don't need to update them as you do. 'Update entities' compilation setting is there in order to let you avoid the shadows and bsp tree computation when the map is already compiled.