One day last summer, I sat in seat 50H of an A-330, watching the downward-facing camera as we landed on pristine white concrete, with the the first isolated tire marks just coming into view at the top of the screen. I heard a few gasps, which seemed to be from passengers watching the same view I was.
I didn't think about video delay at the time, but that's the obvious explanation. (I remember that the touchdown came just as I was thinking that we were a few seconds from landing -- and I guess on the video, we were.)