Fans of the Battlestar Galactica reboot have always been privy to information most shows keep secret. Ron Moore famously did a commentary podcast after each episode where he sat at home drinking scotch and giving details on the making of the show. It’s a fantastic thing to listen to on its own, or in conjunction with the episode. You should seek them out. But a lot of that information is available via the BSG bible, which has made its way online.
A show bible is a document that the creators use to establish the universe and characters the writing team will be working with. It keeps things consistent, and also gives everyone a clear focus on the show’s agenda. The BSG bible holds a few tidbits of info that aren’t common knowledge, but most of it is info only super fans will find exciting.