Jake Vadik was originally supposed to appear in this episode as Satan, but couldn't due to scheduling conflicts.
Frederick Grey was based on Steve Martin's character in the movie Leap of Faith (1992), as well as real televangelists like Pat Robertson and Jimmy Swaggart.
Frederick Grey's office is actually Stan's father's office. His father is a pastor and theologian who went to Liberty University.
Frederick Grey's name is based on a recurring character's name in the James Bond films.