I read a rumour online that stated you could see through Darth Vader's mask eye-lenses at the end of the movie, during the Death Star trench scene, and see David Prowse's eyes(Darth Vader's 'body' actor in Eps I -> III). I had some free time today and slow-mo'ed through my Special Edition DVD with these parts with Darth Vader and confirmed this (see pic 1). More interestingly, and I think I'm the first to see this, it seems like digital artists have composited Hayden Christian's "yellow" eye onto a shot (see pic 2). This is weird because you can see both David Prowse's eye AND Hayden Christian's "yellowed" eye super-imposed above it. It happens at 01:50:32 on my UK, Region 2 DVD. I used VLC to alter "Adjust and effects" to find these. For my monitor, hue is set to lowest, Contrast is set full, brightness is set to ~80%, saturation 50% and gamma 10%.