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One of the prime locations featured on CBS' The Big Bang Theory is the hallway that separates Penny from Leonard and Sheldon. But did you know the now-iconic divider, as well as the always out of service elevator, were not originally part of the show?

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That's just one of the secrets gleamed from the bonus features on BBT's newly-released season five DVD set, which also includes a gag reel and three never-before-seen featurettes!

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Check out ETonline's exclusive sneak peek and click here to buy your copy!