Thanks to vbangle's awesomeness, today I came into possession of Wookiegroomer's Splitscreen of the GOUT/2004. Upon flipping through it, I noticed something:
Notice the stripe at the far right of the screen on the bottom image? At first I thought it was a SE continuity fix to match up with the next shot of the shuttle:
However, upon further examination, it looks like the GOUT was zoomed in on the original filmed element and the SE just pulled back a bit, not sure why.
But more examination brought up more problems:
As you can see, there's no stripe in the long shot. Nor is there one on Vader's shuttle on his approach:
"Ah," but you say, "Vader's shuttle isn't the Emperor's therefore no stripe!"
Then why are there two stripes on Vader's when he lands?!