6. In an interview, Robert Kirkman said that Norman Reedus (who plays Daryl) originally auditioned for the part of Merle Dixon. Though he was rejected for that part, the show-runners were so intrigued by his performance that they created the part of Daryl just for him.
7. In the season 2 episode “Bloodletting”, Blue Sky, the blue meth manufactured by Walt and Jesse in Breaking Bad, can be briefly seen in Merle Dixon’s drug stash.
In the show Breaking Bad, Walter White and Jesse Pinkman manufacture 99 percent pure crystal methamphetamine. The drug has a distinctive light blue color as a result of the chemical formula Walt used to get around sales restrictions pseudoephedrine, hence the name Blue Sky. The drug also makes an appearance in The Walking Dead in Merle Dixon’s drug stash along with other medicine. Both these shows are from AMC network.(source)
8. It took about two months to build the set for the prison, West Georgia Correctional Facility, which provided residence for many of the characters.
9. The walker that bit Amy on the neck in the first season was the show’s production designer Greg Nicotero.
The death of Amy was a very important scene of The Walking Dead, as it establishes the gravity of the situation the characters are in as well as setting the tone of the entire show. According to Emma Bell, the actress who played Amy, Nicotero placed a skin colored prosthetic filled with viscous red liquid and a hose on her neck which would burst when bitten and look like severed flesh. For the scene, Nicotero himself enacted the walker who attacks and bites Amy.(source)