Tiffany Haddish was once homeless and living in her car, just like her character Ms. Hill.
This is the first episode were Ms.Hightower raises her voice and insults her students to be quiet. This running gag was heavily used in The Proud Family (2001-2005).
At the end of the pep rally, Penny and her friends recreate the "Supa Hot" meme, with Dijonay as the guy who screams and magically comes back into the frame.