Computer-generated imagery
Computer-generated imagery was used in much of "Days Gone Bye", particularly when Rick encounters a legless walker. "The woman was wearing basically blue stockings and then everything was cleaned out. There is an alarming amount of CGI in the pilot episode and in the whole show, and you would never know it," said Robert Kirkman. Kirkman felt that Stargate Studios, which was chosen by producers to edit the pilot episode, did a splendid job. He stated: "There's a shot where Rick is riding off on the horse and his hat actually blew off, and they really liked that shot, and so they had Stargate go in and digitally put the hat back on his head."