1) Breaking Bad creator Vince Gilligan intended to kill off Jesse Pinkman in the first season.
2) Breaking Bad episode "Ozymandias," sees Walter White rolling a barrel of money through the desert, passing the same pair of pants he'd lost in the pilot episode.
Daredevil (Netflix Original)
3) The initial black suit from Daredevil is modeled after the one depicted in the Frank Miller comics.
4) Elden Henson plays Daredevil's Foggy Nelson, while Iron Man's Jon Favreau played him in the 2003 film, Daredevil.
5) Arrow was only allowed to credit Harley Quinn as "deranged squad female".
Agents of S.H.I.E.L.D.
6) Despite Agents of S.H.I.E.L.D. giving the character Deathlok, a more human appearance, Deathlok's cyborg comic form is visible in an x-ray. The picture compares the comic appearance (left) to the x-ray appearance shown on TV (right).
7) The Simpsons creator, Matt Groening had initially planned Krusty the Clown to be the secret identity of Homer, hence their similar design.
8) Daniel Sousa of Agent Carter, who is played by actor Enver Gjokaj, previously appeared in The Avengers as an NYPD officer.
House of Cards
9) President Barack Obama tweeted the nation before House of Cards' season two premiere, asking for "No spoilers, please".
10) Lost originally planned to have Michael Keaton as Jack Shephard on Lost, then kill him off in the pilot.
11) Part of The X-Files' theme song was accidentally created when composer Mark Snow rested his elbow on the keyboard with the echo function on.
12) Many South Park episodes contain a hidden image of an alien, obscured and only visible for a single shot.
The Walking Dead
13) In The Walking Dead Merle Dixon is seen to own a bag of blue meth, a reference to Breaking Bad.
Daryl, later, even describes their dealer as a "janky little white guy.", possibly as a nod to Jesse Pinkman.
14) Harrison Wells' 2024 newspaper displays a "Wayne Tech/Queen Inc. Merger," the first formal indication of Bruce Wayne/Batman's existence in the show's universe.
15) The Flash's Cisco Ramon wears t-shirts referencing The Big Bang Theory's Sheldon Cooper, paying back Sheldon Cooper's frequent use of Flash t-shirts.
16) Gene Roddenberry created the transporters in Star Trek to avoid repeatedly filming the Enterprise taking off and landing.
Better Call Saul
17) In Better Call Saul's pilot, Jimmy McGill's future car (Cadillac Deville) is seen parked next to the character's, then, Suzuki Esteem.
18) The Better Call Saul nail salon where Jimmy McGill's office and home are, is the same one he later attempts to sell Jesse Pinkman for money laundering.
19) In 1988, Paramount considered making a Doctor Who movie with either Michael Jackson or Bill Cosby as the title character.
20) In the 1991 Twin Peaks' finale, Laura Palmer tells Cooper "I'll see you again in 25 years." The Showtime revival of Twin Peaks is set to release in 2016, exactly 25 years later. Creepy, or what?