I didn't have any trouble getting the video and audio off the dvd but there seemed to be several different cuts of the movie (which I only saw in DVD decrypter)
The one I found that synced up to the movie properly was in VTS_04 -> PGC 03 (the time being 1:43:08)
The one DVD decrypter sent me to initially was an hour and 52 minutes long, it synced up with the RiffTrax for the first 10 minutes or so, then
the sync lines were completely off