Rick lights three matches in the hospital stairwell in Episode 1.01 "Days Gone Bye."
Morgan is the first person in the television series to call the undead Walkers.
Shirewilt Estates is the name of the community Noah's family lived in.
Rick's unit number on the police car he took in episode 1.01 "Days Gone Bye" is 134.
Episode 7.01 is titled "The Day Will Come When You Won't Be." These are the words Dr. Edwin Jenner told Rick in 1.06, TS-19.
At :08 seconds into this video.