These are the same cars being shown to the press, (returnable) deposit holders and potential customers. Many reviewers are desparate to pick fault with the Model S. At the very least, comparisons are being drawn against other competing 'premium sedans' made by Audi, Mercedes, Porsche and BMW. Putting something out with questionable fit and finish seems a little dangerous, even if it is under the caveat of not being a general production car (which I though the Amped car were).
I'm not trying to knock Tesla or pick fault, I have a massive respect for the company and Musk, and want the model S to succeed (obviously, I have a reservaton and hold stock). But I think in the cynicle world we live in, they need to be a little more catious. As many of the Telsa employees have said, they're a company of 'car nuts', and that's very evident with the quality of the drive. I just hope that doesn't also reveal a lower priority in internal fit and finish, as you cannot do that when you're playing in the same league as the big German manufacturers.