I mentioned this in the other thread about the Graham knock-on, but the camera angles they chose with which to view the incident were bizarre. The first angle, which was more of a side angle, showed the knock-on a lot better. You clearly see the fingers come into contact with the ball and the ball deviate. But we never saw this angle again. The front-on angle, which is the one they then persisted with for like 6 straight views for some reason, didn't show it as well, as Graham's hands were more behind the ball from this angle.
For the people who don't think there was a knock-on, this is the angle they probably remember and I'm not suprised, since this is pretty much the only angle they looked at. The decision aside, that is pretty incompetent in itself.