Ok, I am going to say it because nobody on this forum has even considered this possibility:
The reason for the Tesla sell-off post earnings was/is the supplier bottleneck. Elon said that it will take 6 months to sort it out. They just delivered 5150 vehicles and guided towards 5000 in Q3, and the market extrapolated another 6000 in Q4 (based on 21,000 guidance for full year).
Going into earnings there was evidence that Tesla was producing at a 25,000 - 30,000 annualized rate. So the market was extrapolating 23,000 for FY13, and since they didn't get it the stock sold off.
The reason for this sell-off is that the market figures it will have almost 6 months of minimal growth from Tesla (production pretty much the same, high margin growth offset by low ZEV revenue). So the market thinks that it will be able to buy back TSLA at the same price towards the end of the year. And there is no reason to hold, since you are exposed to execution risk as well as other risks.
Tesla simply can't grow fast enough to justify its stock price in the short run.