Great episode. Milton's demise was fairly predictable, as was Andrea's after the next-to-closing scene.
The migration of at least some of the Governor's populace to the prison was kind of unexpected, but will do nothing more than to piss off the Governor. And those who made the migration were clearly non-combatants, which will make the Gov more confident that he can take the prison. (The question begged of course, is where are the Gov and his remaining loyalists?)
That said, the clear rift developing between Carl and Rick is intriguing. Can't wait until the series resumes in October.