But now that he changed them, you wonder why he did, and then you find out it was because he felt it looked to old, even though you never thought it did, but now you can't help but see it every time you watch the movie... Should have just left it well enough alone.
It's not like we saw people driving around in 1970's Buicks and Lucas has to "update" it and make the streets full of 2005 Nissan's and Fords. Because in 10 years, he'd just update it again and fill the city streets with 2015 model BMWs or something. It will never stop.