I found it interesting that when the Hobbits returned to the Shire, their characters seem so much different than when they left. It is for obvious reasons of course, as they have been through so much.
Before, it seemed to me that they were all simple folk. Minding their own business, never looking for trouble, and tending to their gardens. Now they return with a renewed confidence, able to lead the rest of the Hobbits in an attack of the ruffians. Its interesting to me that none of the other Hobbits (at least up until this point) have noticed or commented on the changes in the Hobbit's personality.
Its also interesting that Rosie commented to Sam that Frodo may be in much danger and Sam should not leave him alone. I liked that Sam found humor in that, as he and Frodo had been through so much together already.