I can't see any inset at all, though a better picture might be able to resolve that. I'm not sure what you mean by the casing being "extraneous" either. It seems to be quite plain, actually, at least on the one. That red one, though, is pretty ugly. Frankly, the stylus is the most obvious difference.
I guess, ultimately, I don't know what to say about all of this. Minimalism has been a trend for quite a while now, given how many products (including many of Apple's) that display it. Is Apple one of the trendsetters? Do they make beautiful products? Absolutely.
But all this patent silliness about getting each others' products banned has just got to stop. Every penny spent on it keeps them from hiring engineers to make something even better than what we have now. I don't like seeing Apple's products banned for using a Motorola standard any more than I like seeing the Galaxy Tab banned for being too minimalist. If they had any sense, they'd call off the lawyers and settle with each other before they waste any more money.