The cosmonaut at Northern Lights is named Yuri, a possible nod to Yuri Gagarin the first human in space.
Twice, Yuri uses the ASL (American Sign Language) sign for "alone" (spinning his finger).
"The mortuary where the survivors run into to escape the zombies is named Dr. Phibes mortuary. Which is most likely a nod to The Abominable Dr. Phibes (1971) films.
The game Citizen Z and Yuri are playing is Dead Rising 3, a zombie videogame.