Serial numbers have nothing to do with the order that the car was built on the production line...
Serial numbers are assigned to the car after the order has passed through edit and all sales codes are verified to make sure that there are no conflicts... The VIN number is the sequence that the cars pass through edit...
The assembly line sequence number is also listed on the build sheet and is the order that the cars go down the production line... Assembly line sequence numbers are usually in increments of 10's and end in zero... That way if they have to squeeze in a car or two or few between them they assign a vehicle assembly sequence number that is not zero.... That is because if they have to resequence one car, they don't have to reassign new sequence numbers to the ones after it.... They have the ability to squeeze in a few without having to go back and resequence all of the cars after that....