I just figured out a major plot point in Battlestar Galactica! All Along The Watchtower is the song that keeps playing throughout the series, as a theme or leitmotif. The lyrics reference character archetypes and events in the series. The character archetypes are pretty explicitly assigned in episode 3.20 'Crossroads' when Chief Galen Tyrol says to Sam Anders, "...way out of here." That's something the joker said to the thief, if the story in the lyrics is true. Soon afterwards Anders says, "No reason to get excited," which is something the thief kindly spoke.
Now for the events of the series referenced. In order to understand this section, you might want to read this essay on the meaning of the lyrics in All Along The Watchtower. Basically, the joker and the thief are outsiders, riders approaching the watchtower from the wild. The Chief and Anders are Cylons and thus don't belong in the confusing world of humans. If you ever wondered why Galen was one of the Cylons who voted to leave in 4.16 'Deadlock' I think this is why. There's more stuff but that will have to come in a later post.