That earlier cars are bayed while later cars are shipping might actually make sense. I'm totally speculating, but if they found a problem in the early production runs, they'll park them until they have time and parts to fix the problem (which could be simple or complicated). But if the fix was folded into the line (which would be the priority), then the cars rolling off the line can go right to the truck. It seems backwards, but it's not. You want to fix the line first, then go back and fix the orphans. Which is why it sucks to be an early adopter (I was an early adopter with the 1993 Mazda RX7 R1 and definitely learned my lesson).
There was a weatherstripping around the windows problem on the Pontiac Solstice that affected the first 4200 cars. A lot were shipped to a plant in Baltimore from the assembly plant in Delaware for testing and fixing before being shipped out.. I had #4723, which was almost fixed..