Sorry if this has already been pointed out (I am the other side of the world and there have been rather a few posts over night - for me).
Tesla have done something smart that has been dressed up as being a good citizen. To quote from the report "During Q1, we consistently produced 400 or more Model S vehicles per week, for a total of over 5,000 during the quarter. We recognized 4,900 vehicles as revenue, exceeding our initial Q1 guidance of 4,500, despite physically delivering a higher number of vehicles, as the standard for revenue recognition was extremely high."
They state that they delivered over 5,000 MS's, however, they only booked 4,900 against revenue. Next quarter, there will be a lag in booking those MS's sent to Europe, however, they have in effect stuffed the Q2 numbers with that overhang from Q1.
Further "While we expect to build about 5,000 Model S vehicles in Q2, some cars will be in transit to Europe for start of deliveries in Q3. As a result, we expect to deliver slightly over 4,500 vehicles during Q2, all in North America."
Tesla delivered more than 5,000 in Q1 with a shutdown in the first week and a learning curve to climb. Produced more than 400 per week.
Assuming that they can do the same again in Q2...
Overhang from Q1 - 100 at least, maybe 200
Surplus again 200 in Q2
Extra week 400
So they could ship 800 in Q2 to Europe and still do 4,900 in USA without blinking.
Add in production experience, and you have another missed (to the good) target.
Expectation management (as with Apple) with better than expected results.
Same thing with Q1 - the 4,750 update number ended up as the de-facto number used by everyone.
Q3 will pick up the overhang from Q2 - the ca800 in transit European cars that will be delivered in Q3.
Etc etc etc.
Lastly - do the math. 21,000 expected deliveries (not built - but delivered) for 2013, less 4,900 for Q1 is 5,366 for each subsequent Q.