Although not directly referenced, David Castañeda claims that his dance sequence was inspired by 90's clips like Moving Color and Will Smith dancing.
The name of the barbershop where Klaus meets Reginald is "Nite Owl", one of the main characters of Watchmen.
Klaus saying Ben Patrick Swayzeed him, when Ben manages to punch him across the face, a reference to Ghost (1990), in which Swayze plays a ghost who learns to possess people's bodies.
Season 2
The magazine that Ben and Klaus find after walking out of the alley has Bobby Darin on the cover, as one of his most famous songs plays over the scene.
Diego snarking to the psychiatrist about his daddy issues and says "Tell that to Luke Skywalker". When no one reacts to his reference, he lampshades it by saying he knows they won't get it but it's a good reference.
The kids calling Luther King Kong.
Klaus naming his cult Destiny's Children. Sound familiar?
Five on Diego: "Think of Batman... and then aim lower."
Later on, Diego seems to be trying to do his best Batman impression as he growls to Foroga Oga that she will be dead by nightfall.
When Allison tries to explain her powers to Raymond, he asks her to show it as proof and when she says no he replies with "So Wonder Woman has super powers, but no one can see them?"
Klaus seems to be almost literally channeling the The Exorcist when he literally expels Ben from his body by throwing up.
When the two Five's fight, Young Five seems to be invoking Cap.
Old Five: You getting tired yet? Young Five: I can do this all day.
The Stranglers' "Golden Brown" plays in the third episode right after Luther gets knocked out in a bare knuckle boxing match. The same song also plays right after a knockout in a bare knuckle boxing match in Snatch..
Season 3
Allison's response to two hotel rooms split between six siblings:
Klaus compares Viktor to Carrie in terms of becoming upset, losing control of their powers, and causing lots of damage.
The name of Hotel Obsidian’s receptionist is Chet.
Klaus being chased by an angry Amish mob who believe that he stole their kugelblitzed cows closely resembles Indiana Jones fleeing from Peruvian natives through the Amazon Jungle.
Once again, the Batman reference gets thrown at Diego, with Allison calling him "Bargain Batman" when he brings up his vigilante shit.
When Klaus discovers that he has Resurrective Immortality, he tells his mother in the afterlife that he thought that the times that he came back to life was like a Looney Tunes character in that cartoon birds were flying around him.
When Lila agrees with the others to hand Harlan over to the Sparrows, Viktor angrily calls her Little Britain.
