I don't think you mean ghosting. You mean motion blur, where as you scroll rapidly or move something it appears to have a trail or double image. Ghosting refers normally due to a static image with a faint ghost image of the main image appearing offset (i.e. a bit to the left or right etc).
The motion blur is due to the panel refresh and is only noticeable because of the massive screen size. It's the way the LCD interacts with your eyes. Actually it is present on the Air, you just don't see it because of the smaller size.