With overcast sky there is a slightly curved horizontal line on the sky. Above this line the sky is overcast, below this line the sky is clear. When moving my head to the left and right a little bit this line moves in a strange way (using Oculus Rift). This happens on all tracks.
not sure if its only a VR thing, but a lot of the car mirror cams are positioned wrong -some mirrors actually show the front side of the mirror in their view + adjustment not quite working right also maybe this is also on the list too