During an interview, Robert Kirkman claimed Norman Reedus (Daryl) originally auditioned for the part of Merle Dixon. He was rejected, but his audition so intrigued the show-runners that they created the part of Daryl just for him.
The word "zombie" is never used. The zombies are either referred to as "Walkers", "Geeks", "Skanks", and to the CDC, "Test Subjects". In season 2 the terms "Roamers", "Lurkers", and to Hershel, "People", and "Lame Brains" are added. In season 3 "Biters" was introduced to the lexicon. In season 4, "Skin-Eaters" was used. In season 5, "rotters".
A walking dead companion series is set to take place in California, and is rumored to come out late 2015. The companion series will have nothing to do with the original series, but will use new characters to give us a different view from the beginning of the apocalypse.
In an online interview, it was revealed that Frank Darabont envisioned having several self-contained episodes that would not continue the main story. One such episode would have been the season two premiere. It would have involved Sam Witwer (who Darabont used in The Mist (2007) and played the tank zombie in the series premiere) as a solider in a Black Hawk Down (2001) style Atlanta. Witwer would have encountered several of the cast before being bit and locking himself in the tank.
Originally, the characters of Lizzie and Mika were first going to be casted as different gendered twins, with Mika being the boy named Mike; however after Kyla Kenedy's audition via Skype, they scrapped the idea to cast her.
According to Norman Reedus, he accidentally incited a small panic among 'Walking Dead' fans when a photo surfaced of him sporting a prosthetic dismembered stomach. This photo does not spoil the end of Daryl Dixon, but rather Reedus' character in 'Pandorum.'
The actors portraying the walkers are actually more talented than one might think. They have to walk and sound like the creatures, while also avoiding breathing too much. They also have to jolt their limbs to take bullets realistically, and effectively pretend to eat fake human flesh.
The season 2 premier was an extended episode because budget cuts forced showrunner Frank Darabont to combine the original premier "Miles Behind Us" with another episode titled "What Lies Ahead". Most of the cuts from "Miles Behind Us" can be found in the deleted scenes of the season 2 dvd.
The trivia items below may give away important plot points.
The description that Daryl gives of Merle's drug dealer (who most likely sold him blue sky meth considering he had it in his bag earlier in the series) sounds an awful lot like Jesse Pinkman from Breaking bad. The drug dealer has some sort of child in his life (Brock), in described physically as small and skinny, and says the word "bitch"
Dale had not originally been scheduled to die as early as he did in the show. However, after his close friend, Frank Darabont, was fired as showrunner, DeMunn asked to be killed off. Later, he had a change of heart, but his death had already been scripted and budgeted for, so his request to continue on the series was denied.
Seconds after the Season 5 mid-season finale 'Coda' ended, AMC's facebook page mistakenly shared a picture of Daryl carrying Beth's corpse, with the caption "RIP Beth". It was badly received by people who had not watched the episode yet in the West Coast, Europe and South America.
In the comics, during The Governor's prison attack, Judith is killed after Lori is shot and falls on top of her. The writers used this to worry comic book fans when Judith's carrier was filled with blood in Season 4, Episode 8.
In the show, Michonne hates The Governor based on a hunch and he only loses an eye. However, in the graphic novels, he brutally rapes her for days, leading to the loss of his eye, arm, and testicle when she gets her revenge.
All of the seven main characters to die as of the end of the fourth season (Dale, Merle, Governor, Lori, Andrea, Shane, Hershel) have all been brought down mercilessly by another character, whether it's before or after reanimation.
A Greene family member has died in three of the four mid-season finales. Zombified Shawn and Arnold Greene were put down by the group in season 2. Hershel was decapitated by The Governor in season 4. And Beth was shot by Dawn in season 5.
The coat that Rick wears in the last episodes of season 4 and most of season 5 belongs to "Claimer Lou" the man he strangled in the bathroom at the house he Carl and Michonne were staying at after the prison
The last line of Season 4 on TV is "They're screwing with the wrong people". However, on disc, Rick says f-cking instead. Andrew Lincoln only did one take of the censored version because he liked the similarities to the comics.
In AMC's 'Breaking Bad', Walt rents a red Dodge Challenger from a man named Glenn. Coincidentally, Glenn Rhee from 'The Walking Dead' drives an exact model in the Season 1 episodes: 'Guts' and 'Tell It To The Frogs'.
When Bob, Tyreese, Daryl, and Michonne hear the Terminus broadcast message from the radio, it was eight days before Bob would make his way there and nine days when Daryl and Michonne would. Tyreese has not made it there yet
Scott Wilson who plays Hershel Greene appeared in the 1999 TV movie "The Jack Bull" as a character called "Governor." Ironically, he gets killed by "The Governor" played by David Morrissey in "The Walking Dead."