"In Loco Parentis" is Latin for "in the place of parents." It may refer to the University's relationship to the student, or the stakeholders in the legal system who are supposed to weigh and support the interests of the victim. It could also refer to Carisi and his sister's support of Mia, because of, or in spite of, her dysfunctional family background.
Ryann Shane, who plays Carisi's niece Mia, previously appeared in season thirteen's "Father Dearest (2012)".
Rachel Bay Jones played Heidi Hansen in the original Broadway cast of Dear Evan Hansen. In two episodes, Mallory Bechtel guest stars. Mallory Bechtel made her Broadway debut in Dear Evan Hansen as the character Zoe Murphy.