Ok, straight to the point. When for instance a tree is swaying in the wind, there are pixels left behind that don't match. They are usually white and really clear to see. For an example of this, go to this YouTube video and fast forward to 2:10.
So when looking at Unity, there are white lines if you look in the centre of the screen on an edge of a counter top. These really bug me because in my game, these are generated by trees and it looks horrible! Please fix these!!!