In 2, episode 13, "Beside the Dying Fire," was shot at night and was so cold outside that show editors had to digitally remove vapor leaving the actors mouths.
Shane (Jon Bernthal) showed up with a beard in the midseason season 3 finale. He was filming The Wolf of Wall Street and due to contractual agreements, he couldn't shave it off.
Andrew's real last name is Clutterbuck.
There is a series of webisodes released in 2011 that showed the backstory of the "bicycle" zombie that Rick shot in the series premiere. Though the running time of all the webisodes is under 20 minutes, it took the crew nearly 27 hours in the Georgia summer heat to complete.
The Walking Dead video game: A Telltale Games Series, received over 90 "Game of the Year" awards in 2012. The game is released episodically, just like the show.