Thank you to matrixgrindhouse for the review on fanedit.info, especially this part...
There is, a significant problem with the frame rate on the DVD version, however. It appears to have been rendered as 30 frame per second progressive video. Normally, a primarily 24p feature film sourced edit such as this would have been rendered as a 30 frame per second, 60 field per second interlaced format flagged as 24p. That would have resulted in the standard 3:2 pulldown effect. The way this edit has been rendered results in uneven frame repeats, which is visually jarring. It would also interfere with attempts to IVTC the material for viewing on a 120hz display with 1:1 frame repeats. I suspect any attempts to speed it up for a PAL display would also be problematic. If you have no idea what any of this paragraph means, you'll probably not notice any sort of visual flaws whatsoever. But if you have an overly critical eye for such details such as myself, it's going to probably gnaw at you a little. It isn't unwatchable by any means, but this issue can be corrected quite easily with a re-render.
As it turns out, the culprit was DVD Architect. Since I don't have the Pro version, it insists on recompressing video because it doesn't support 24p video. Fortunately, I still had my original encoded file, and Captain Khajiit over at FE.org showed me a way (outside of Architect) to replace the recompressed video with the original encoded video.
There is a new DVD now available on info. It includes the fixed framerate version of the main movie, an extra 2-minute bonus feature (a split-screen comparison of the diner scenes from AOTR and Seinfeld), and a snazzy new title ("14th Month Anniversary Edition") on the main menu.
Unfortunately the download link on info also includes an extremely NSFW picture along with the dlc. I did not upload that and have asked for it to be removed.
Big thanks to matrixgrindhouse, Captain Khajiit, and also ThrowgnCpr for valuable input and feedback. :-)