This isn't the real reaction yet wait for the conference call.
I only skimmed the report but nothing is a huge red flag.
problems
"Q1 cancellations are likely to remain elevated"
To get the cancelation rate
"As a result, we added more than 6,000 new reservations in Q4, up from almost 2,900 in Q3."
"After deliveries and cancellations, our net reservations at year end, were over 15,000, up from about 13,000 at the end of Q3"
"we delivered pproximately 2,400 Model S vehicles during the quarter"
So, with a 0% cancelation rate, net reservations should have increased (6000-2400)=3,600. Since net reservations only increased 2,000, that means that 1,600 cancellations occurred in Q4. A significant amount. Probably about 1/2 to 1/3 of reservation holders asked to convert to non refundable configs.
Dealbreaker? Not really IMO. It's an expensive car, of course some people have second thoughts.