And in retrospect, our expectations should have been more accurate. I'll try to find the quote, but I'm pretty sure when Elon described the manufacturing ramp-up (maybe at the investor meeting or maybe on the last conference call?) he said that (very loose paraphrasing to follow...) they would build a batch at one car a day, pause, see if everything is ok, then build a batch at two a day, pause, make sure everything is still good, etc.
We are usually much more thorough than this. We let what we want blind us to the information that was already out there.
I think we need to get used to this pattern. I suspect this will continue until we reach 20k units.
EDIT:
I think there was another quote that I am remembering, but this one hints at what we are seeing as well.
"We’re keeping exact ramp, sort of confidential and in part because we want to as we increase the production, we want to stabilize it at various plateaus, evaluate the quality if it looks good, then ramp up. And our goal is to be at a run rate, an annualized run rate of greater than 20,000 you’d see at the end of the year."
Elon Musk, Q1 2012 Conference Call