Trivia: The show is based on a comic books series written by Gerard Way, who was the lead singer for the band My Chemical Romance.
Trivia: Simon Pegg's extended cameo as Hughie's father is a specific nod to the comics - the look of "Wee Hughie" in the original comics was based on Simon Pegg. Artist Darick Robertson said "it was important to capture an innocence but tough determination in Hughie. Two things that seemed to contradict each other and somehow in early sketches he kept looking too old. When I saw Simon Pegg in Spaced I thought he captured that balance perfectly." Pegg knew he was too old to play the character himself, but was happy to play his father.
Not All Men - S1-E7
Trivia: When Taissa leaves work and sees an angry man in his car repeatedly trying to jam his straw into his drink, the logo on the cup is the Busy Bee Cafe logo. The Busy Bee cafe was seen in the original Twilight Zone episode Nick of Time with William Shatner.
Trivia: Will Keene, who plays Father McPhail, is the real-life father of Dafne Keene, who plays Lyra Belacqua, the main protagonist in the series.
Trivia: While it's not explicitly stated, the Superman from another earth played by Brandon Routh is the one from Superman Returns (and by extension that from the original Superman movies). Aside from the obvious factor of the same actor, he name checks his son Jason, which is what his son with Lois was called in that movie too. His reference to fighting himself relates to Superman 3.
Trivia: **SPOILERS** When the demon takes over Ciri's body she dreams about being back at the party her grandmother had at their castle, and she sees her grandmother, Mousesack, her mother and her father. When she starts to question if it's really her grandmother, Mousesack and her mother all turn to ash and blow away. If you pay attention, you'll notice that her father does not turn to ash which is a foreshadow for later when it's revealed that he is in fact still alive.
She Was Killed by Space Junk - S1-E3
Trivia: The Doctor Manhattan - themed sex toy that Laurie receives is called "Excalibur." This is a clue to Doctor Manhattan actually being Cal Abar, i.e. when he returns to his Doctor Manhattan form, he is "ex Cal Abar".
Trivia: Despite the overall level of accuracy in the show, one deliberate choice was to use "comrade [surname]", rather than the full name as is typical in formal Russian address. It was felt it would be too distracting for viewers.