Stephen Colbert's holiday special, A Colbert Christmas: The Greatest Gift of All was conveniently timed to come out on DVD two days after it premiered on Comedy Central, which is fitting, because by the time you get to the end, you realize you've been watching an extra-long commercial for the DVD version all along. But with all of the hilarious extras on the disc, it's okay (in this case) to fall for the spiel hook, line and sinker. Hell, they should have advertised the soundtrack album, too, because that alone is worth having, if only for car-trip sing-alongs. Here's what you get if you spring for the DVD, instead of just watching it on the teevee.