I’ve compiled a few screenshot comparisons to better demonstrate the visual difference, especially in color. You can see that in re-rendering the movie for the Blu-ray, the frame has been considerably brightened in most every shot. Because of this, components such as the painted elements retained a greater amount of detail in the 35mm print than the current digital re-render. It wasn’t until I compiled these that I realized there were also a great deal of visual changes from this trailer to the Blu-ray as well. Given that we’re looking at the trailer, it’s unclear whether or not these changes were already present by the time of the finalized theatrical release, or were altered in post for the Blu-ray. I guess If I had a Cam Rip from 2004 I’d have a sure fire answer.
http://screenshotcomparison.com/comparison/149708 (Bubbles now emerge when the door swings open)
http://screenshotcomparison.com/comparison/149711
http://screenshotcomparison.com/comparison/149709 (“Shell City” sign now on top of the gift shop)
http://screenshotcomparison.com/comparison/149713 (Completely different render)