At the party, Mitzi (Kaia Gerber) tells Maxine, "This is my first modeling gig." Kaia (daughter of Cindy Crawford) began modeling in 2012 with Versace when she was 10 years old.
When Norma moans as Maxine and Douglas are moving her bed into the house, it sounds very much like the "Tarzan yell" that Carol Burnett frequently performed on The Carol Burnett Show (1967).