Mike Faist filmed this show around the same time he filmed West Side Story, hence the reason his character doesnt appear on screen a lot in this show because he was only available at certain times to film while working on West Side Story.
Both Olivia Scott Welch (Heather) and David W. Thompson (Diggins) appeared in Fear street: 1994.
In the first episode the main character Heather tells a story to her little sister about a girl made of dirt and the people in her town tell her she's "nothing." This story refers to herself. Heather's last name is "Nill" and "Nil" means "nothing" in latin.
Both Mike Faist (Dodge) and Rachel Bay Jones (Sherri) were part of the original Broadway cast of Dear Evan Hansen