Jerry Adler (Sidney Feinberg) & Peter Gallagher (Father Phil) also worked together on episode 7.10, KSR (2015), as Howard Lyman & Ethan Carver respectively.
Peter Gallagher (Father Phil) mentions his parish is having a movie night and showing Grease, and how he admires the character of Danny Zuco. When a school is burning down, the firefighters tell Father Phil to stay outside, and he refuses, saying "Danny Zuko would go in there." Peter Gallagher's first Broadway role was playing Danny Zuko in Grease.