flynn2000 said:

The only quibble I have with it is Vader's cloak brightening, starting at 1:08:17. I don't think the benefits of making the cloak stand out more from the darkness make up for the high graininess swarming over it. Plus it looks like a matte is moving over it. I'm curious to see how others see it.

This is the only thing I noticed too. It also may have something to do with how lower-bitrate encodes deal with very minor color differences. It may be OK at a higher bitrate, not sure. Didn't look quite right how it was IMO.