In Pam's computer address book, we see an entry for Robbie Abolt under "Margot's classmates." Pam notes "has a crush on Margot." His last name differs from his mother's due to divorce, as confirmed by Sev Ohanion, the writer and producer of Searching.
Robert's fake username on YouCast is "fish_n_chips," which points to the obvious theme of the movie, catfishing. (The mascot of Margot's school just happens to be the catfish, after all.) Robert pretends to be someone who he's not in order to form a relationship with Margot and extort money from her.
Using the persona "fish_n_chips," Robert lets Margot know that his favourite Pokemon is Kecleon, which changes its body colour to blend in with its surroundings — which is more or less catfishing in a nutshell.
The lead detective's name is Rosemary Vick. In Rosemary's Baby, Rosemary gives birth to evil. Vick Mackey is a corrupt police officer in FX's The Shield. As we know, it's Rosemary's son who commits the crime itself, and the detective undoubtedly turns out to be pretty crooked in terms of how she handles her son's wrongs. Ohanian confirmed the significance of these two Easter eggs.