Mary Gillis plays Mrs. Hagberg, who appears in "Prom Queen" teaching home economics, in "I Am Unicorn" teaching geography, in "I Kissed a Girl" teaching math, and retires from her tenured position as a history teacher in "The Spanish Teacher", though she returns for an end-of-the-year ceremony in "Nationals".
Mary Gillis spiller Mrs. Hagberg, der vises i "Prom Queen", som har undervisning i hjemkundskab i "I Am Unicorn" , har undervisning i geografi i "I Kissed a Girl", har undervisning i matematik, og trækker sig tilbage fra hendes faste ansættelse som historielærer i "The Spanish Teacher", selvom hun vender tilbage til en end-of-the-year ceremoni i "Nationals".