Hmm... Well, I don't have LW in front of me right now, but if I remember correctly, then the polygon statistics panel (^H, W) will show any non-planar polys.
You have four options to try and eliminate them:
1. Manually adjust points to make them planar.
2. Convert the object to subpatches
3. In the surface editor, change the max smoothing angle
4. Triple all 4 or greater point polys.
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