Everybody is going on about Scaramouch saying penis and Ashi being the focus of the episode, but I don't see a lot of discussion on the ghostly samurai that led jack to the suicide cemetery.
Considering how he had been physically communicating and fighting with Ashi, it's established that he was a real being, unlike the imaginary voices Jack had been arguing with for the last several episodes. So that begs the question as to what or who he was. If he wasn't the manifestation of Jack's desire to kill himself, was he the ghost of samurai honor? Is the graveyard itself magic and that's why Ashi could see it? Have other people been able to see this ghostly horseman following Jack around for some 50 years?
It seems like such an interesting and vague topic, but people are ignoring in favor of the cameos.