I was wondering if I have missed something about the numbers. Do they HAVE to correspond with their seat number on the 815 flight? I know that Jack was 23 and that was his seat on the flight, but if this is true for all the characters then I may have found a mistake. In season 1 Exodus (I think part 2) Hurley is seat 20 as said by the lady punching in his information for the flight. Error, or do the numbers not neccessarily mean their seat on the plane?