Well, then, reading that article on the various deinterlacing modes, the judder would seem to be simply an unavoidable artifact of trying to play a 24-frame movie on a 30-frame progressive scan video monitor. The reason you don't notice the judder when it's running interlaced is because the fields tend to blend together better in interlaced mode.

Either that, or you're seeing the player trying to deal with error in the field coding on the disc itself. But that wouldn't explain why the TV's internal deinterlacer (which works by observing the differences between frames) would have the same problem.