I'm annoyed by the lack of closure for Jesse. Walt's final act of altruism to his family was done through Gray Matter. I would have also liked to see Walt use his influence there to get Jesse a job at Gray Matter. Jesse, while not possessing any chemistry knowledge per se, has proven himself to be an apt pupil and would make a capable lab assistant. This would also tie in to the earlier sequence where Jesse was unsuccessful in his attempts to get a real job and live a "normal' life. Right after it showed Jesse driving away, the plot would have moved forward to Jesse exploring the new laboratory he will be working in. Then, the series would end on Walt's final scene in a flashback, making the same type of sentimental motions as Jesse was doing. Finally, this would have allowed Jesse to create a stable life for Brock and find a new girlfriend.