Visible crew/equipment: In Cirith Ungol where Frodo is tied up, as the Uruk and Orc fight, Shagrat throws Gorbag on top of the hole. In the next shot of Gorbag, as he brings his left leg up out of the hole, three circular lights are visible in the hole below. It may be necessary to darken the brightness of your screen, in order to see the three lights properly. (Extended Edition, Disc 2).
Picture edited by Super Grover