Don't Bug the Mosquitoes - S2-E12
Trivia: The Wellingtons, who sang the Gilligan's Island theme song, appeared in this episode as Gilligan's favorite group The Mosquitoes.
Ozymandias - S5-E14
Trivia: Holly says to Walter "mama" after he changes her diaper. This scene wasn't scripted but Bryan Cranston kept going, realizing it was gold.
Trivia: This episode contains another reference to Sherlock Holmes. Wilson tells the (fictional) story of who had sent House a present. Wilson says it was one of House's first patients called Irena Adler. He then explains that House had feelings for the patient, but did not take it any further and therefore regards her as the 'woman who got away'. Irene Adler was an adversary who bettered Sherlock Holmes - the woman who got away. As it happens, the fist patient House treats in the pilot episode is called Rebecca Adler.
The Night Dr. Loveless Died - S3-E4
Trivia: Dr. Loveless' uncle's name, "Liebknicht", is, aside from the addition of the letter "k", German for "Loveless".
Trivia: (POSSIBLE SPOILER) When Masuka brings up the list of doctors authorized to get the M99, Dexter removes his alias note that Dexter's fake alias (used to get the M99 tranquilizer) is Dr. Patrick Bateman. Patrick Bateman is the lead character of "American Psycho". This was most likely an intentional "easter egg" of sorts within the show.
The Austere Academy: Part One - S2-E1
Trivia: Mr. Poe rhapsodizes over a saccharine sweet book called 'The Pony Party.' That was the title of the fake book printed on the reverse of the dust jacket of 'Lemony Snicket: An Unauthorized Autobiography.'
Trivia: Across Season 4: Two Lois Lanes appear together in this season: Teri Hatcher played Lois Lane in The Adventures of Lois and Clark and Dana Delaney voiced Lois Lane in Superman: The Animated Series and its follow-ups.
Trivia: Sherlock's parents are played by Benedict Cumberbatch's real-life parents, Wanda Ventham and Timothy Carlton.
Attack Of The Mutant (1) - S2-E2
Trivia: The bus which Skipper keeps catching to go to the headquarters has "Goosebumps" adverts on the side of the bus, saying "two thumbs up."
Trivia: Only Fools and Horses was recently voted Britain's Best Sitcom, beating BlackAdder and the Vicar of Dibley into second and third place respectively.
Trivia: Dr. Spencer Reid is the son of an attorney, born in Las Vegas. In real life, Matthew Gray Gubler, the actor who plays Reid, is also the son of an attorney, born in Las Vegas.
Trivia: Doug Ross frequently hung his head low, appearing ashamed or thoughtful or privately amused, depending on the scene. This wasn't just an element of the character: George Clooney had taken to writing his lines on papers, sheets, and other props.
Trivia: A sinister aspect of an otherwise lightheated comedy, but the fact is that Hogan and his men are war criminals. They engage in combat activities behind enemy lines when not in uniform, and worse, while wearing enemy uniforms. The Germans tried that during the Battle of the Bulge and those arrested were shot.
Trivia: When Batman whispers something to Deadshot and Deadshot says he'll tell, Wonder Woman asks Superman what Batman said with Superman saying she doesn't want to know. In an interview, Kevin Conroy stated that what he whispered was, "I know where you live, Floyd."
Fifty Shades of Grey Matter - S2-E11
Trivia: Liv listens to an audio erotica novel which is read by actress Kristen Bell. Liv replies "I always felt a kind of connection to her." iZombie was created by Rob Thomas, who also created the series Veronica Mars which starred Kristen Bell.
Trivia: In many episodes you can see a pennant near the jukebox that reads Stacey vertically. That's in homage to Henry Winkler's wife, Stacey Weitzman.
Horror Fiction in Seven Spooky Steps - S3-E5
Trivia: This episode features a pay-off for a joke that was established in the first two seasons. In season one, the character Professor Slater mentions the name "Beetlejuice" while trying to recall Britta's name. In season two, Britta refers to Jeff's underwear as "stripey Beetlejuice numbers" during a conversation. And in this episode, Annie says that Britta has the "Beetlejuice" soundtrack on her computer. As Annie says the name, the character Beetlejuice is visible briefly walking by a window in the background, his name having been said three times. (In the film "Beetlejuice", he is summoned once his name is spoken three times).