When in the movie theatre with Tyler, McKenzie wears the same shade of fingernail polish as Hannah Baker in Season 1.
Alex's game "Desert Duty" is a fictional analogue for the Call of Duty (2003) game series, but the scene shows a shopping bag from real-life games retailer GameStop as well as a real Xbox One console.
Alisha Boe (Jessica Davis) and Ross Butler (Zach Dempsey) also appeared together on two episodes of Teen Wolf (2011) as Gwen & Nathan respectively.
Amy Hargreaves (Lainie Jensen) & Jake Weber (Barry Walker) both worked on four episodes of Homeland (2011) together as Maggie Mathison & Brett O'Keefe respectively.
Steven Weber (Principal Gary Bolan) & Justin Prentice (Bryce Walker) both appeared in episode 2.17, Reflections of the Way Liv Used to Be (2016) of iZombie (2015) as Vaughn Du Clark and Brody Johnson respectively.