|Rules and Regulations|
Charlie's guitar? Edit
I'm pretty certain the guitar Jacob leaves Hurley belonged to Charlie, and equally certain that we'll never know for sue. While no real evidence is offered to indicate who owned the guitar, the context in which it is given seems to imply that it belonged to a dead friend of Hurley's who played the guitar, which would seem to point to Charlie and not Libby (unless she was once a country-western singer or something).
Jacob's Dead? Edit
Is really possible that Jacob did not died in the last moments of the episode. Considering the great amount of time that he has lived in the island, it is possible that many people has tried to kill him, with no sucess. He is something like the god of the island, so he cannot possibly die without giving resistance.