In the beginning while selfies are being discussed, there is a brief scene of a suited man using a selfie stick while posing at the end of his car in a parking spot. The spot had the name "Bring" stenciled on it. The man taking the selfie was Harry V. Bring, executive producer of the show.
The character William Pratt is a monster "created" in a sense by an older boy. William (Henry) Pratt is the birth name of Boris Karloff, most famous for portraying the Frankenstein Monster.
The names of the victims, suspects, and affiliates all have names related to Buffy the Vampire Slayer and Angel: Tara Harris, Riley Summers, Alexander Chase, Jonathan, Andrew Wells, Dawn Rosenberg, Joyce Giles, Charles Lorne, Daniel Osbourne, and Connor Holt. The teen characters all go to Sunnydale High School.
When walking into Tara's house, Morgan quotes the title from The Internet Is Forever (2010), which also revolved around the dangers of the online world.
Then internet stars Jenna Marbles (Jenna Mourey) and iJustine (Justine Ezarik) are referenced. Justine Ezarik previously had a minor role in Middle Man (2010).