Eric, again the DVD is 480i(not 420), and your player can deinterlace the i to p. If the TV has a native resolution of 720p, then it deinterlaces 480i to p(if the player hasn't already done it)and scales the 480 up so that it can be shown on the 720 screen. As I said before, no, an "upconverter"(scaler)can't actually convert to full 720 resolution. If a separate one would do a better job of scaling to 720 than the TV does(no way to know beforehand)then the picture would look slightly better.

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Enjoy the music, not the equipment.