One thing I'm glad TCW did with Onderon was that it pretty much retconned the stupid moon thing. The original setup had Onderon with a large moon in a really really low orbit, so close that the planet and the moon somehow shared atmospheres, with an isthmus of atmosphere that the flying beasts could use to move between the planet and moon. It made my head hurt. So many things were wrong with it. It's an example of the kind of thing that makes me be of the opinion that people should be required to have at least a cursory grasp of orbital mechanics / astrophysics before they sit down to write sci-fi.