17. In the show Michonne hates The Governor because of a hunch and he only loses an eye. But, in the graphic novels, he brutally rapes her for days, and he loses his eye, arm and testicle when she takes her revenge.
18. Steven Yeun’s parents, who emigrated from Korea, watch the show faithfully with Korean subtitles and asked him to thank Melissa McBride for saving his character’s life in the show. Even though Yeun reminded his father that it was only a show, Mr. Yeun insisted upon expressing gratitude, which Yeun then did.
19. There is an actual mental illness called the Walking Corpse Syndrome, the sufferers of which believe that they are dead and do not exist.
Also known as Cotard’s Syndrome or Cotard’s Delusion, the Walking Corpse Syndrome is a rare delusional psychosis in which the sufferers often describe loss of blood or organs and/or body parts, imagining themselves to be decomposing dead or non-existent. The syndrome was named after a French neurologist, Jules Cotard, who first described the condition.(source)
20. In Season 3, the make up team had used darker skin tones for the walkers to show that they decayed further as the time progressed.
21. The Walking Dead was actually shot on 16 mm film to give it a natural gritty look and to allow the zombie makeup effects to be most effective on screen.
According to the director of photography, David Boyd, at first they thought they would RED, some other digital camera or even 35 mm for shooting. But someone had brought a few rolls of 16 mm, which when they tried gave them a certain texture and grain that allowed them to film the zombie make-up effects more effectively making them look very believable. Boyd, who shot another series completely with just 16 mm, also did the same with The Walking Dead and was also responsible for making the show on time, under budget and yet looking great.(source)