2008-oct-14 13:15PST: Reference number 239
The reason that most people miss is an overdependence on the CG that is somewhat pervasive today. Sure the first one had it too but it found ways to keep it low-key and non-disruptive. The problem with this is that too often the frames seem like a collection of different overlayed things rather than drawn how a true scene is with some sense of coherence or connectedness. They take shortcuts, ie. perspective is applied to the background but not the characters, or just inconsistently, to some characters and not others. First season, they did the proper thing to apply perspective to the whole scene, not just the background.