Yeah, the DVD player uses TFF and RFF flags in the MPEG-2 stream to be able to take the 24fps and add the pulldown on playback. Because 24 frames/sec are all that exists for original data, and the 30 frames/sec doesn't do any sort of magical tweening, no, 30fps is no smoother. In fact, people who watch a lot of PAL insist they can see the jerkiness of the field doubling when watching film-based stuff on NTSC.