Mira meets David at Kristen's house, and Mira finds out that David is training to be a priest. After David leaves, Mira coyly asks Kristen, "What are you doing, fleabagging?" This is a reference to the Phoebe Waller-Bridge TV series "Fleabag." In 2019, there was a flurry of lifestyle articles (in Cosmopolitan, Men's Health, The Guardian, among others) about the fact that "fleabagging" had become a new slang term in the dating world, although its exact meaning was the subject of some dispute (the title of the Guardian article was even "Everyone's Talking about Fleabagging-But No One Can Agree What It Is"). The general consensus was that the term mean "repeatedly dating men who are wrong for you so as to sabotage your chances at a functional relationship," as the main character does in "Fleabag." However, in this episode, Mira uses the term in a far more specific context: during "Fleabag"'s second season, its main character becomes romantically involved with a priest. So Mira is asking Kristen if she is really about to become intimate with David even though he is a priest.
This episode's title, "Vatican III," is both a reference to the three investigative assessors sent from Rome and a play on "Vatican II"--the colloquial term for the Second Ecumenical Council of the Vatican (the papal proceeding during the early to mid-1960s that was responsible for major theological and practical changes and modernizations in Catholicism).
This is the first episode in the series not to feature Kristen's daughters.
First appearance in the series by Kristen Connolly playing Mira Byrd, Kristen's friend and police officer.