Goof: During the car scene when David and Maddie are discussing confessions, her seat belt is first over her jacket collar, then below, then over again...
Interesting choice of title, clearly for comedic effect. The song of the name reference is indeed heard during the episode.
However, the church and clergy in the show appear to be Roman Catholic. The hymn in question, 'All Creatures of Our Lord and King,' is not ususally accredited to that tradition. It is most commonly heard in the Anglican/Episcopal churches and other Protestant denominations.
(Maddie catches David spying on the woman across the way)
Maddie: You give bacon a bad name!
(During an argument in the car; David claims Maddie doesn't understand religion)
David: Take confession.
Maddie: You take confession.
(On his plans to leave the priesthood)
Fr. McDonovan: I can't go back.
(David, furious, is ready to storm out of the church)
David: Why am I wasting this on you? You know everything, right?
Maddie: Where are you going?
David: Back to the office.
Maddie: I have the keys to the car.
David: I'll take a cab.
(The detectives continue to argue as they leave the rectory)
David (to Maddie): You were warned! I warned you! But did you pay attention? No!
(The priest goes to hand David an envelope with the agency's check)
Fr. McDonovan: Wait. You forgot this.
David: Put it in the poor box.
(In Maddie's car, as the detectives head out to meet the client)
Maddie: You don't have to come if you don't want to.
David: It doesn't matter whether I go or not. What matters is what's said once we're there.
Maddie: He's a big boy, David.
David: Oh, right, I forgot. I'm talking to a heathen.
Maddie: A heathen?
David: That's right. A heathen.
Maddie: Look, I'm not saying there's a supreme being, and even if there is, tell me the world's a better place because of religion.
David: The world's a better place because of religion.
Maddie (to David): He's our client. We owe him the truth.
David (to Maddie): I find this repugnant. A priest is going to break up a marriage, and we're going to help him!
David (to Maddie): We're messing with things that we shouldn't ought to be messing with!
(After Fr. McDonovan explains he may leave the priesthood and get married)
David: Far be it from me to tell anyone how to live their life, Father, but don't you think you ought to try living together for a while first?
(David walks into Maddie's office, where she is holding a shotgun in order to test a theory about the case. She points it at him.)
Maddie: Put this gun in your mouth and pull the trigger.
David: Aren't you going to make me dig my own grave first?
Maddie: Fine. Great. All of you, go to hell.
Father McDonovan: This is where she lived...I never even saw her face. Now she doesn't have one. It doesn't matter now. Her suffering is over. For the people she left behind, it's just beginning.
Maddie: I didn't know we were getting involved with someone who was capable of adultery!
David: 'Cause you didn't listen! I don't even think you know how!
Agnes: You don't have to leave on my account.
Bert: I wasn't. Look, I don't hate you. I know you think I do, but I don't.
Agnes: No. I don't. I don't think that. And besides, it doesn't matter. Because I hate you.
David: You know...I'm probably closer to you than anybody else I know out here.
Music: "All Creatures of Our Lord and King"; David sings The O'Kaysions' "Girl Watcher"