I have a cute lil' error I found in the Fellowship

Okay. In the scene where the ringwraiths are chasing Arwen on their horses, and they do a faraway shot, there are only 8 nazgul riding, not 9 as there is supposed to be. And also look closely in the scene where the ringwraiths ride through bree, before they come into the inn. You can see, just for an instant, one of their faces !!