Ellery Sprayberry, who plays young Werewolf Tierney, is actually the real-life sister of main cast member Dylan Sprayberry.
This episode marks the return of Matthew Del Negro. Del Negro last appeared in Season 4 episode "Time of Death".
Dominic Burgess is yet another Arrowverse actor to appear in Teen Wolf -- he appeared in the Flash
Lucy Loken who plays Quinn is another Arrowverse star to appear, she played a young Lena Luthor in Supergirl