...You can see that the snow is much darker. Is it even snow? The picture below shows the old Ski Village. You can see that the snow was much more thicker and whiter.
...The best example is the Snow Forts. Compare the ground to the actually forts. Then look around, at where the trees are. It's obviously pavement on the ground and the snow has been pushed aside.
So, when Rory and his construction team were working away, getting rid of the left over snow from the blackout, they must of added pavement on top of the snow. It's very interesting seeing the difference between both rooms. The trees are far better quality, and so are all the graphics!