Did You Know Gaming? do very good work over on Youtube. Taking your favorite series, and diving as deep as they can in the about 6 minutes, it unveils the history behind franchises and games, as well as little quirks about their production.
And here is one on the now classic, Batman: Arkham Asylum. It goes over the game's production, secrets, things that didn't make it into the game and how the influences were worked into production. It's all pretty interesting.
Take a look at it here: