* AbortedArc: Possibly a case of RealLifeWritesThePlot: the end of Season 3, involves Frank working with the NYC Public Advocate, a woman named Grace Newhouse who's thinking of running for Mayor. In fact, in the next episode [[spoiler: Mayor Poole is shot, and Ms. Newhouse becomes Acting Mayor until Poole leaves the hospital]]. Although she's apparently going to run for Mayor, she becomes BrotherChuck. In RealLife at the time, the NYC Council President Christine Quinn was running to become the first female Mayor of New York, which may have inspired the Grace Newhouse character; during the summer hiatus, she lost ground in the Democratic primary to Bill de Blasio, and lost the race. It's possible that this persuaded the writers to drop the character inspired by her, and/or because they'd realized that David Ramsey's Mayor Carter Poole had become an EnsembleDarkhorse who had an interesting relationship with Frank.
* AlternateCharacterInterpretation: Danny, being a major example of the CowboyCop trope, is subject to this a lot within the fandom. The show seems to encourage this, since some of the showrunners worked on TheSopranos, and probably wanted to include at least one morally grey character. Basically, opinion on Danny is divided between those who approve of his policing methods and those who find them excessive:
** Those who agree with Danny feel that his willingness to break procedural rules is justified given what he goes up against, and at worst view his harsh actions against as merely an example of PayEvilUntoEvil. This is somewhat borne out by these kinds of offenses being committed against the worst people he's dealt with on the show, several of these were out of desperation, and that there are also many examples of him exercising restraint and doing things by the book even when dealing with some really nasty people.
** Those who disagree with Danny's methods often view him as dangerous, reckless, and view him as having a disturbing disregard for New Yorkers' civil liberties, and many view him as being a KnightTemplar who often comes unnervingly close to becoming as bad as the people he fights. One reviewer pointed out that when Danny decides that a suspect is guilty, he goes after them with reckless and extremely aggressive tactics...[[{{OhCrap}} but what happens if he ever mistakenly becomes convinced that an innocent person is guilty?]] Not to mention the dubious legality of some of Danny's methods.
*** Given that Grandpa Henry virtually always (loudly and vigorously) agrees with Danny during debates at the dinner table, opinions on Grandpa Henry have lately also become divided along the exact same lines, with Danny's supporters admiring Henry's opinions, and Danny's detractors disagreeing with them. This is likely intentional, due to Henry being a police officer back when that sort of thing was more common.
** Around season three or so (and even moreso by Season 5), the show appears to have become much more aware of the UnfortunateImplications caused by Danny's methods (and Henry's support of these methods), and there have now been several episodes where various characters call Danny out for his tactics, and where Danny and Henry (in separate episodes) wind up in hot water for their CowboyCop tendencies/views. Even Frank and other family characters have now given Danny and Henry a WhatTheHellHero speech. Frank has also noted that the decline of methods used back in Henry's time is unquestionably a good thing, because back then officers could and ''did'' rough up people who turned out to be innocent, and that the public nowadays is more trusting and cooperative than it was in the past.
*** This is borne out in the season 4 episode "Secret Arrangements", where Danny is one of several cops being investigated by the D.A.'s office. Frank thinks that while Danny doesn't go ''over'' the line, he steps ''on'' the line, and that his son has always been quick-tempered, impulsive, [[ItsPersonal takes his job personally]]. [[DaChief Sergeant Gormley]] tells Frank that Danny is incredibly aggravating and drives him nuts, "but if you've got any others like him at home, please send them my way." At the end of the episode Frank talks to Danny about the newest revisions to the NYPD's interrogation guidelines, detailing recent additions used by their best detectives, as well as methods that would no longer be used or tolerated. Danny snarks about which section he's likely to be in, and Frank responds that he's actually in both. In summary, Danny's an excellent cop and one of the NYPD's best detectives, but he ''needs'' to rein himself in.
* CompleteMonster:
** Dick Reed, the {{serial killer}}/[[SerialRapist rapist]] from season 1's "Re-Do," is a thoroughly [[HeManWomanHater misogynistic]] SmugSnake who gets his conviction overturned because [[OffOnATechnicality a lab tech screwed up the protocols]]. He scares his surviving victim into silence and lets one of his fanboys have her. He also beats his sister and ties her up for saying something she "shouldn't have." He shows zero remorse and no redeemable qualities and after [[SlashedThroat slitting a janitor's throat]], he finally attempts to perform his usual MO on Erin Reagan, the ADA who convicted him, before she is saved by Frank.
** The Phantom, aka Donald Washington, from season 2's "The Life We Chose," is a cold-blooded crack dealer and murderer. He shoots detective Cruz and kills Detective Gates, who [[IHaveAFamily pleads that he has three kids]], to which Phantom replies "Too bad for them". This [[EvenEvilHasStandards shocks his cohort]], who was only planning on robbing them. Phantom [[YouHaveOutlivedYourUsefulness later kills his cohort]], targets Ray Bell, a man who ratted him out to the police, and holds Ray's family hostage.
** Yuri Denko, an {{arms dealer}} whom Erin prosecutes in season 2's "Working Girls," is a cold-blooded {{sadist}} who has no problem executing a man's wife in front of him in their living room over a business dispute. He then threatens the man's children in a courtroom outburst to scare him into not testifying, then has him killed after the threats scare him into running. He puts out a hit on the surviving witness, hounding her mercilessly, and went after her grandma back in Russia, too (the FSB got there first and protected her).
* CriticalResearchFailure: At the beginning of "Hall of Mirrors", there is a cricket game being played in Central Park with remarkable accuracy, except that there aren't any wickets. It's funny as hell.
* DrinkingGame: Take a drink whenever someone runs as soon as they see a cop, people pray at the dinner table, or [[HeyItsThatGuy whenever you see an actor from]] ''Series/TheWire''.
** Or another every time one of the younger family members at the Sunday dinner table asks Frank to take sides with them in an argument against one of their siblings and Frank responds by saying "Pass the potatoes" or "The salad is great" or something else food-related to dodge the question. The show has made it a RunningGag, actually, much to the frustration of the younger Reagans (usually Danny, Linda, or Erin).
* HarsherInHindsight: The very first line of episode 3x22 ("The Bitter End") is Jamie's partner Vinny announcing "This is it, Reagan! This is the end!" upon arriving at the Bitterman Housing Projects (nicknamed "The Bitter End" in-universe). Vinny means it as a pun on the projects' nickname...but the episode [[spoiler: ends with his death at the hands of the local gang]]. Vinny himself notes the irony when this happens, and [[spoiler: in his dying moments, he smiles and repeats to Jamie "I told you, Reagan...this is the end. It's the end...]] Definitely a TearJerker.
* LikeYouWouldReallyDoIt:
** Frank is shot at the beginning of "Dedication" in a drive by. He lives.
** Via creative editing and judicious use of a {{Stock Sound Effect|s}}, [[NeverTrustATrailer the trailers for the season 3 premiere]] made a valiant effort to convince us that the Criminal of the Week would blow up Danny and Jackie. He didn't.
* StrawmanHasAPoint: Erin often gets slagged with this trope.
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