In nearly ALL the shots in the movie, when the cast are wearing sun glasses in the desert of abydos, you can clearly see reflections of the crew and those big boards that do something to the lighting or shadows. It's so obvious. Now, some people may say that reflections are an unavoidable part of film making, but George Lucas purposefully avoided it in Star Wars. Why would they place all the crew right infront of a reflective surface? Great examplea are at 00:31:56 and 00:38:42 into the film. (00:34:43 and 00:41:30 in the directors cut.)