Walkers do not blink. Blinks are edited out via CGI.
The Donald Trump walker in Episode 5.03 "The Cell" was not an intended Easter Egg.
The Denial of Saint Peter by Caravaggio is the painting in Dr. Steven Edwards’ office in episode 5.04 “Slabtown.”
Carol's handgun used to kill Lizzie in episode 4.14 "The Grove" is the same type used to kill Lee Harvey Oswald, a .38 Caliber Colt Cobra
Episode 4.08 "Too Far Gone" is also the name of the thirteenth volume of the comic books.