OK, just spent about half an hour directly A/Bing the DVD with the Blu-ray. I loaded the Blu-ray into my Blu-ray player and the DVD into my old Toshiba HD-DVD player (yes, I still have one of those) and synced them up so I could simply switch inputs to compare. Both inputs are calibrated identically and set to output the native resolution of the disc, so all the video processing is being done by the HQV chip in my JVC projector. I am sitting back about 12 feet from my 11 ft. wide 2.35:1 screen, so the image is quite large relative to my seating position.
Yes, there is definitely subtle left to right shifting on the Blu-ray that the DVD does not possess. It starts out fairly noticeable then diminishes as the film progresses. To my eyes, it is subtle and barely noticeable except during the credits. On my first viewing of the disc a week or so ago I did not really notice it on the credits either. Obviously it is not subtle to Jellydonut's eyes, though! Not a judgement call, just an observation that artifacts that can drive some people to distraction may not bother others at all.
What I did notice, though, is that the Blu-ray utilizes a print in considerably better shape than the DVD. Sharpness, color and overall condition of the print are MUCH better on the Blu-ray. Just check the beginnings of chapters 12 and 13. Notice all of the scratches and blotches on the DVD. They are absent on the Blu-ray. Detail on the Blu-ray is almost night and day better as well. Of course, the detail improvement may not nearly be as noticeable on a smaller screen. On my setup, though, the DVD looks downright blurry compared to the Blu. It's just too bad that the Blu-ray exhibits this issue