* AbilityOverAppearance:
** The producers had a choice between keeping Slade Wilson as an American, like in the comics, and casting Maori actor Creator/ManuBennett in the role. They took the second option and turned Slade into an Australian spy.
** Stephen Amell is also a case of this, if only because of his ''hair color'' - in the present day he looks mid-to-dark brunette as Oliver (like Stephen is in real life), but in flashbacks where he has longer hair and a beard both are dyed a dirty-blond (making him resemble the comic's Oliver Queen a lot more). Because it would be hard to die his short-cropped hair (let alone his ''stubble''), and because Amell portrays the character so convincingly, most people treat this as AcceptableBreaksFromReality and are generally not bothered by it... Worth noting is that Oliver's ''probably'' supposed to have a shade of blond in the show as well (that simply looks darker in the present thanks to lighting and shortness), because both his parents are blond and Thea [[spoiler:is really Malcolm Merlyn's biological daughter, thus explaining her own brown hair.]] Further, Amell also has a larger frame compared to the comics' Ollie (who has toned arms but otherwise has less musculature than heroes like Batman and Superman - his frame would be more in line with ''Series/{{Smallville}}'''s Justin Hartley in comparison), but again he's captured the essence of the character far to well for anyone to be bothered by this.
** [[spoiler: Caity Lotz taking over for Jacqueline [=Mcinnes=] Wood as Sara Lance is also an example. Season 1 firmly established her as a tall, raven-haired woman and both of those traits became an important plot point for her family's arc late in that season. Caity Lotz's entire appearance is far different from Jacqueline [=Mcinnes=] Wood's, but her excellent portrayal of the character made the fans ignore and look past the major ContinuitySnarl caused by the recasting.]]
* ActingForTwo: [[spoiler: Celina Jade as Shado and her twin sister Mei.]]
* ActorAllusion:
** At one time, Laurel snarked at Tommy if he's planning to take her to ''Film/MonteCarlo''.
** Willa Holland (Thea) is pretty much playing her character from ''{{Film/Legion}}'' - a rebellious teenage daughter to an upper-class family.
** Felicity having a DisappearedDad may be a reference to Emily Bett Rickards' role in Music/{{Nickelback}}'s music video [[https://www.youtube.com/watch?v=Nt2kM0TsubU&NR=1 "Never Gonna Be Alone"]] where she plays someone who also has a DisappearedDad (albeit in a more TearJerker way).
** Thea describes Roy Harper as 'Abercrombie-looking'. Guess which company his actor modeled for? Revisited in "Broken Dolls", where Sin also keeps calling him ''Abercrombie''. It becomes her AffectionateNickname for him.
** Barry mentions that [[ICantDance he can't dance]]. [[Series/{{Glee}} Some might disagree]].
** A flashback in "Heir to the Demon" reveals that Mrs Lance was a Professor. Creator/AlexKingston has played a Professor [[Series/DoctorWho before]].
** Tatsu is handy with katanas, just like Yukio, the character Creator/RilaFukushima played in ''Film/TheWolverine''. She's also tasked to "babysit" the WhiteMaleLead there, though this time she has her entire family helping her with the "job".
** The ''Series/{{Spartacus}}'' alumnae also get this.
*** Katrina Law's character is still an ArcherArchetype ActionGirl. This time though, ''she'' is the one [[GirlOnGirlIsHot who kisses a girl]].
*** As of Season 3 Episode 8, Creator/ManuBennett and Nick E. Tarbay's characters are [[spoiler: now cellmates. In ''Spartacus'', the gladiator quarters is very much like an "open prison"]].
** Creator/BrandonRouth [[Film/SupermanReturns once again]] flying around in a red and blue suit. In "Suicidal Tendencies", Oliver calls Ray "Supersuit", and Felicity calls his photo imaging tech "X-Ray vision".
** During her EarlyBirdCameo in Season 2, [[Series/TheFlash2014 Caitlin Snow]] had a scene where she has to run away from a blade wielding masked killer. [[Film/FridayThe13Th2009 Hmmm...]]
** In Season 3 episode 19, [[Film/SupermanReturns Ray]] fights Deathbolt, whose eye beams greatly resemble Franchise/{{Superman}}'s heat vision. He defeats him [[WesternAnimation/SupermanTheAnimatedSeries by using his hands to cover up the eye beams at point blank range, resulting in blowback.]]
* ApprovalOfGod: Stephen Amell has "Meme Monday" on his Facebook page, where he reposts memes of the show that he finds funny. He's also done some bizarre one-offs, such as "Lightsaber Saturday" where he does the same sort of thing only with a specific theme.
* CreatorBacklash:
** A mild example, compared to others -- Stephen Amell has quite happily gone on record with his displeasure over the marketing for Season Two...namely that the posters highlight the ensemble cast, but leave out Paul Blackthorne and Susanna Thompson. He similarly criticized WB for announcing plans for a ''Flash'' film and a new actor the day after ''The Flash'' posted strong second-week ratings, showing true staying power, feeling it undercut both the show and Grant Gustin.
** Caity Lotz was understandably not pleased with her character's treatment in Season 3, being [[spoiler:killed off in the premiere and then strung along for more appearances anyway]]. She did two (as a fake voice, and a hallucination), and then refused to do any more.
*** However, as she is set to, somehow, reprise her role in the upcoming Arrow/Flash Spinoff, she seems to have gotten over this.
** Marc Guggenheim and co. admitted "[they] fucked up" with how they forgot about Roy at the end of the Arrow vs. Atom fight in "Suicidal Tendencies". They also wished, in hindsight, to have Oliver [[spoiler:join the League earlier to allow more time to play around with "Al Sah-him"]].
** Though he doesn't express regret about the part, Creator/ManuBennett of all people [[http://comicbook.com/2015/04/04/manu-bennett-thinks-arrow-took-deathstroke-in-the-wrong-directio/ feels that the show didn't quite do his character justice]], especially with his Season 3 appearance wherein he suffers BadassDecay [[spoiler:being beaten by Oliver and Thea alone]].
* DawsonCasting: Averted for the most part, as most of the young adult characters are portrayed by actors 2-4 years older and so convincingly pass themselves as those ages; Katie Cassidy (Laurel Lance) and Emily Bett Rickards (Felicity Smoak) are in fact ''younger'' than their respective characters. The flashbacks, on the other hand, cannot avoid this pitfall because they also function in chronological order but are always 5 years behind the present-day scenes: 23-year-old Willa Holland stands out when portraying a 15-year-old Thea Queen in Season 3's "The Return".
* DuelingShows: With ''[[Series/AgentsOfShield Agents of S.H.I.E.L.D.]]'', as both series fall under the long-standing DCComics[=/=]MarvelComics rivalry.
* DyeingForYourArt: Katie Cassidy lost a significant amount of weight during the production of season two, to better convey Laurel's addictions to painkillers & alcohol. The following season, Katie bulked up in the gym as Laurel suited up as Black Canary.
* ExiledFromContinuity:
** Certain big-name characters such as Franchise/{{Superman}} and Franchise/{{Batman}} cannot appear in this universe as WB has reserved them for exclusive use within the [[Franchise/DCCinematicUniverse emerging movie franchise]].
** Despite him already appearing, ComicBook/{{Deadshot}} was made unavailable for the show for movie franchise reasons, after Creator/WillSmith was confirmed to be playing him in ''Film/SuicideSquad''. [[spoiler:It was explicitly confirmed that this is why he was killed off in season 3 episode "Suicidal Tendencies".]]
** Several other characters were made off-limits as well, including Harley Quinn and Ted Kord (as mentioned below).
* FakeMixedRace: American of Indian heritage Janina Gavankar plays the possibly half-breed (judging from the surname) [=McKenna=] Hall.
* FakeNationality:
** Stephen Amell, the Arrow himself, is Canadian.
** As is Emily Bett Rickards (Felicity Smoak).
** As is Jacqueline [=MacIness=] Woods ([[TheOtherDarrin the original]] Sara[[ContinuitySnarl h]] Lance).
** Creator/ManuBennett ([[AussiesWithArtillery ASIS commando]] [[spoiler: Slade Wilson]]) is a New Zealander.
** Jessica de Gouw (ComicBook/{{Huntress}}) is Australian.
** Paul Blackthorne (Quentin), Creator/JohnBarrowman (Malcolm) and Creator/AlexKingston (Dinah) are all British, though all three have extensive US experience, with Barrowman holding dual nationality.
** Speaking of Aussies, Digger Harkness is Australian in the comics, but here played by Lebanese-American NickTarabay.
** Eugene Lipinski (Alexei) is from England, playing a Russian character.
** The late Darren Shahlavi was Iranian-English, but played the American Constantine Drakon.
* FanNickname:
** Fans have started calling [[http://www.greenarrowtv.com/first-look-at-arrows-huntress/12378 The Huntress]] of this show "ComicBook/{{Catwoman}} with a Crossbow."
** Diggle's unborn child has already been named [[Anime/{{Pokemon}} Diglett.]]
** Sally the Salmon Ladder.
** Deathstroke and Brother Blood's Mirikuru-empowered minions are referred to as the Deathstrokes, or some variant of, by many fans, though aren't actually named in the show itself. One of the alternative names is 'The Blood Cult'.
** Laurel has been given nicknames such as {{Blackmail}} Canary (due to her habit to use blackmail on Kate Spencer during the latter half of Season 2) or Fakanary (thanks to some people considering that Sara is the show's true ComicBook/BlackCanary) and now Buckles (thanks to the endless straps on her Black Canary costume).
** Stephen Amell himself has been nicknamed 'Captain Amell' or 'The Captain' by Olicity supporters, thanks to his enthusiasm for Oliver and Felicity's relationship. Other parts of the fandom are now picking it up out of pure affection.
** [[TheVerse The universe or continuity]] itself which also includes Series/TheFlash2014 has been nicknamed "the Arrowverse", in similar vein to the "[[Film/TheDarkKnightSaga Nolanverse]]".
*** Both "the DCCWU" and the "DCW" are also used.
** Brother Eye, a hacktivist group using a flaming eye for a symbol, is [[TheLordOfTheRings "Sauron]][[{{Anonymous}} ymous"]]
** [[spoiler: Ra's Amell]] for Oliver [[spoiler: wearing the League of Assassins attire that was [[TrailersAlwaysSpoil spoiled by ''Flash's'' PaleyFest trailer]]]].
** In some countries, Quentin Lance and (his ex-wife) Dinah Drake are called "Papa Canary" and "Mama Canary" for obvious reasons.
* FollowTheLeader: The success of ''Arrow'' not only spawned a [[Series/TheFlash2014 spin-off]], but prompted [[Series/{{Gotham}} Fox]] & [[Series/{{Constantine}} NBC]] to launch their own shows based on DCComics characters, and Creator/{{Netflix}} to partner with Marvel on a series of shows about street level heroes in the MarvelCinematicUniverse. It can even be argued that ''Arrow'''s success is what led to NBC finally going ahead with the revival of ''Series/{{Heroes}}''. And with ''Series/{{Supergirl 2015}}'' coming to CBS, we'll have gone from no comic-book shows to one on every single broadcast network.
* HeyItsThatGuy: Let's start off with saying that somebody on ''Arrow'' must '''really''' have liked ''Series/{{Spartacus}}'', no less than three actors from that show have shown up. Manu Bennett, Cynthia Addai-Robinson, Katrina Law, and now Nick Tarabay all appeared on ''Spartacus'' before moving here (Liam [=McIntyre=] will also be appearing on ''Series/TheFlash2014''). Especially interesting is the fact that, unlike [[OnlySoManyCanadianActors other examples of actor-overlap,]] ''Spartacus'' was filmed half a world away in New Zealand.
** Oliver once moonlighted [[Series/{{Hung}} as a hooker]]. Laurel herself [[Film/{{Taken}} was almost trafficked as one]].
** Poor [[Series/TheOC Kaitlin's]] family members have a nasty habit of dying.
** [[Series/{{Supernatural}} Benny]] the vampire is a 1%-er now.
** Speaking of Series/{{Supernatural}}, Gadreel is a mobster. And Ruby is a lawyer.
** Moira Queen was once [[Series/StarTrekVoyager the Borg Queen]]
** [[Series/NipTuck Adrian]] is no less crazy as a drug lord.
** [[Series/TheWalkingDead Amy]] seeks Laurel's help to find justice for her father.
** [[Series/DoctorWho Captain Ja]][[Series/{{Torchwood}} ck Harkness]] is a mean shot with a bow and arrow.
*** Funnily enough, both Merlyns have played Billy Crocker in Theatre/AnythingGoes - John Barrowman (Malcolm) in 1989 and 2013-2014, and Colin Donnell (Tommy) between 2011-2012.
** [[Series/BattlestarGalactica2003 Gaius Baltar]] is Dodger.
** [[Series/BattlestarGalactica2003 Helo]] is an enforcer.
** [[Series/TeenWolf Jackson]] is no less Abercrombie in this show.
** [[Series/{{Angel}} Charles Gunn]] is a hitman now!
** [[Series/OnceUponATime Dr. Whale]] isn't too nice, either.
** [[Film/SupermanReturns Superman]] becomes another red-and-blue superhero, Atom.
** [[Film/StreetFighter Ryu]] trained Oliver.
** [[Series/StargateSG1 Dr. Frasier]] is the Queens' defense attorney.
** After leaving the Starling City DA's office, looks like Adam Donner was blackmailed by [[Series/OrphanBlack the Dyad group]] to watch over a clone.
** [[Series/{{Glee}} Quinn's mom]] is Felicity's mom. Speaking of Felicity and Glee, she's dated two Warblers, [[http://en.wikipedia.org/wiki/Grant_Gustin Sebastian Symthe]] and [[http://en.wikipedia.org/wiki/Nolan_Gerard_Funk Hunter Clarington]].
** [[Franchise/TheChroniclesOfRiddick Boss Johns]] is Ra's Al-Ghul
** Captain Boomerang is [[Series/SpartacusBloodAndSand Ashur.]]
** [[Film/{{Titanic 1997}} That guy who followed Jack Dawson to America]] is doing pretty well for himself, having risen to fire chief... after surviving the fire that created Firefly.
** [[{{Series/Heroes}} Adam Monroe]] is Cyrus Vanch. [[HilariousInHindsight Amusingly, he hasn't aged a day.]]
** The first Count Vertigo is [[Series/{{Fringe}} Lincoln Lee]] while the second is [[Film/{{Fargo}} Gaer Grimsud]].
** Lyla Michaels is [[Series/TheWalkingDead Lilly Chambler]].
** Apparently both of Ollie's hosts in UsefulNotes/Hongkong are Japanese, [[Film/TheWolverine Yukio]] and [[Film/RealSteel Tak Moshido.]] Did someone tell them Creator/HughJackman was coming?
** [[Series/TheDresdenFiles Harry Dresden]] is still a detective, but now trying to bring the Hood to justice.
** Alexi is the human form of [[Series/{{Animorphs}} Visser Three]].
** Dr. Ivo is [[Series/DawsonsCreek Doug Witter]] and [[Film/FiftyShadesOfGrey Anastasia Steele's step-father]].
** Bronze Tiger is [[Film/MortalKombat Jax Briggs]].
** [[Creator/NealMcDonough Dum Dum]] [[Franchise/MarvelCinematicUniverse Dugan]] is Damien Darhk, leader of H.I.V.E.
* HeyItsThatPlace: The house that is used for the Queen Mansion is [[http://en.wikipedia.org/wiki/Hatley_Park_National_Historic_Site Hatley Castle]] in Victoria, British Columbia. It was used for the Luthor Mansion on ''Series/{{Smallville}}'' and Xavier's school in the ''Film/XMen'' movies.
* HeyItsThatVoice:
** Quentin Lance is [[WesternAnimation/JusticeLeagueDoom Metallo]].
** [[Creator/KellyHu China White]] is [[WesternAnimation/YoungJustice Cheshire]]. Time will tell if White will develop any interest in Green Arrow's potential protegés. She's also [[Film/X2XMenUnited Lady Deathstrike]] and [[VideoGame/BatmanArkhamOrigins Lady Shiva]].
** Dr. Lamb is [[WesternAnimation/FantasticFourWorldsGreatestHeroes Reed Richards]].
** [[Creator/KirbyMorrow Matt Istook]] is [[WesternAnimation/XMenEvolution Cyclops]].
** [[Creator/AlexZahara Anthony Venza]] is [[Anime/MobileSuitGundam00 Lockon Stratos]].
** Thea Queen is [[Franchise/KingdomHearts Aqua]].
** [[Creator/MichaelJaiWhite Bronze Tiger]] is [[WesternAnimation/JusticeLeague Doomsday]].
** Creator/TaraStrong gets a brief cameo as the voice of [[spoiler: Harley Quinn.]]
** [[Creator/BrandonRouth The Atom]] is [[WesternAnimation/TheBatman the Everywhere Man]].
** Fans of ''VideoGame/FalloutNewVegas'' will recognise Detective Hilton (Roger Cross) as Ulysses, the BigBad of the "Lonesome Road" DLC.
** [[Creator/SummerGlau Isabel Rochev]] is [[WesternAnimation/SupermanBatmanApocalypse Kara Zor-El/Supergirl]].
** [[Creator/SeanMaher Shrapnel]] is [[WesternAnimation/SonOfBatman Dick Grayson/Nightwing]].
** [[Creator/NealMcDonough Damien Darhk]] was himself [[WesternAnimation/DCShowcaseGreenArrow Green Arrow]] and [[VideoGame/InjusticeGodsAmongUs Flash]].
** In the Japanese dub:
*** [[Creator/SatoshiHino Oliver Queen]] is [[LightNovel/TheFamiliarOfZero Saito Hiiraga]], [[LightNovel/ShakuganNoShana Yuji Sakai]] and [[Manga/{{Naruto}} Sai]].
*** [[Creator/SanaeKobayashi Dinah "Laurel" Lance]] is [[Manga/ElfenLied Lucy]] and [[Manga/DGrayMan Allen Walker]].
*** [[KentaroIto Tommy Merlyn]] is [[Manga/{{Naruto}} Choji Akimichi]] and [[Franchise/StreetFighter Yun]].
*** [[KentaMiyake John Diggle]] is [[Anime/MacrossFrontier Bobby Margot]] and [[VideoGame/StreetFighterIV Zangief]].
*** [[NaoyaUchida Quentin Lance]] is [[Manga/{{Naruto}} Madara Uchiha]] and [[Manga/DeathNote Soichiro Yagami]].[[note]]Overlaps a bit with CastingGag.[[/note]]
*** [[Creator/MamikoNoto Isabel Rochev]] is [[Anime/QueensBlade Tomoe]], [[Anime/HellGirl Ai Enma]] and [[VideoGame/SengokuBasara Oichi]]
*** [[Creator/MutsumiTamura Shado]] is [[KillMeBaby Sonya]].
*** [[Creator/JunFukuyama Barry Allen]] is [[Anime/CodeGeass Lelouch Lamperouge]] and [[SpiceAndWolf Kraft Lawrence]].
*** [[Creator/NorioWakamoto William Tockman]] is [[Manga/DragonBall Cell]] and [[Anime/CodeGeass Emperor Charles zi Britannia]].
*** Amanda Waller is [[Anime/GundamBuildFightersTry Sekai Kamiki]].
* IKnewIt:
** Sebastian Blood is [[spoiler:Brother Blood]].
** [[spoiler:Sara Lance survived [[NeverFoundTheBody the sinking of the Queen's Gambit]]. Her being Black Canary was also a popular crack-theory not even five episodes into season 1.]]
** A number of people suggested that due to her brown hair not being a trait inherited from two blonde parents, [[spoiler: Thea wasn't Robert and Moira Queen's daughter. It was revealed in "State v. Queen" that Thea was conceived after an affair between Moira and Malcolm Merlyn]].
** [[spoiler: Malcolm is BackFromTheDead. Okay, technically he never died in the first place, but the point stands.]]
** As soon as [[spoiler:Sara]] asked Oliver "What happened to [[spoiler:Slade]]?" without mentioning [[spoiler:Shado]], people correctly assumed she was killed.
** [[spoiler:Slade's return.]] Given the character's popularity, [[LikeYouWouldReallyDoIt most fans knew he wouldn't be killed like he was]]. Also, since the character is known for being a ''villain'', as soon as they mentioned [[spoiler:what Ivo was looking for and what Brother Blood was doing, many worked out he would be used on Slade and that he was the BigBad]] well ahead of the reveal.
** Malcolm Merlyn being involved in [[spoiler:Sara's death]] in Season 3; not as obvious and many had their doubts, but some still expected TheReveal just the same.
** [[spoiler:Akio, Maseo and Tatu's son,]] dies.
** When Marc Guggenheim revealed a second wedding in Season 3, a lot of people accurately predicted that it would be between [[spoiler:Oliver and Nyssa]].
** Thea Dearden Queen being the show's version of [[spoiler: Mia Dearden was accurately predicted by majority of the fans as early as the pilot]].
* IronyAsSheIsCast: It's worth noting that Paul Blackthorne's best-known role is magician Harry Dresden, and he plays a cop. John Barrowman's most famous role is him playing a sort of secret agent-slash-cop, and he plays a man whose codename is "Magician".
* IWantYouToMeetAnOldFriendOfMine:
** It's been a RunningGag among ''Series/{{Spartacus}}'' fans on whose alumnae will appear next on the show, or on ''Series/TheFlash2014'' for that matter. [[note]]Creator/ManuBennett, Cynthia Addai-Robinson, Katrina Law and Nick Tarabay (and Liam [=McIntyre=] on ''The Flash'').[[/note]]
** Much like ''Series/{{Spartacus}}'', the show and its SpinOff have a knack on casting ''Series/PrisonBreak'' alumnae. [[note]]Creator/RobertKnepper and Creator/PeterStormare here, Creator/WentworthMiller and Dominic Purcell on ''The Flash''.[[/note]]
** Creator/SeanMaher and Creator/SummerGlau were previously on ''Series/{{Firefly}}'' together. [[note]]Ditto Creator/MorenaBaccarin, the voice of Gideon on ''Series/TheFlash2014''[[/note]].
** Grant Gustin, Charlotte Ross and Nolan Funk were all on ''Series/{{Glee}}''. [[note]]Victor Garber (Martin Stein on ''Series/TheFlash2014'') also guest starred on it, so does Bex Taylor-Klaus (Sin) in the penultimate episode.[[/note]]
** Stephen Amell and Janina Gavankar were both on ''Series/TheVampireDiaries''. [[note]]Ditto Rick Cosnett and Malese Jow on ''Series/TheFlash2014''.[[/note]]
** Colin Salmon, John Barrowman and Alex Kingston were all on ''Series/DoctorWho''. [[note]]Creator/ArthurDarvill will be Rip Hunter in ''Series/LegendsOfTomorrow''[[/note]] Subverted by the fact that the characters of Kingston and Barrowman never meet in either show.
* RealLife/MeanCharacterNiceActor:
** Creator/JohnBarrowman as Malcolm Merlyn. Hold most of the [[AffablyEvil mean]], though. He has said it's fun to play a bad guy for a change.
** Oliver Queen, at least early on, was cold, distant, and secretive. Stephen Amell, on the other hand, is incredibly friendly and interactive with fans.
** Nyssa al Ghul is a rather cold, merciless assassin loyal to her father, But Katrina Law is anything but and is very friendly and talkative to her fans.
* RoleReprisal: Played with in the Japanese dub, as Creator/SanaeKobayashi also voiced the Dinah Laurel Lance version of the ComicBook/BlackCanary in the short-lived ''Series/BirdsOfPrey'' TV Series.
* NoStuntDouble: ZigZagged - Stephen Amell does as much of his own stunts as he's allowed, including the infamous salmon ladder which Amell can pull off in real life, with some of the more complicated[=/=]dangerous stuff being done by a stunt double.
* OneOfUs: Head writers Guggenheim and Kreisberg are big comic fans and love continuity gags.
* TheOtherDarrin: [[spoiler:Caity Lotz as Sara Lance, replacing Jacqueline [=MacInnes=] Wood]] from the Pilot. There's even a FlashbackWithTheOtherDarrin.
* TheOtherMarty: Devon Aoki was set to play Tatsu Yamashiro in Season 3. However, she dropped out during filming and her scenes were re-shot with Rila Fukushima in the role.
* ThePeteBest: [[spoiler:Caity Lotz becomes much more remembered as Sara Lance than Sara's original actress, Jacqueline [=MacInnes=] Wood.]]
* PlayingAgainstType:
** The [[IceQueen cold-hearted]] Isabel Rochev is well outside of Creator/SummerGlau's usual repertoire, even moreso [[spoiler:now that it's known she's a flat-out villain]].
** The [[MadBomber bomb-happy]], [[StrawNihilist nihilistic]] Shrapnel is a far cry from Sean Maher's previous roles.
* PlayingGertrude: John Barrowman, playing Malcolm Merlyn, and Colin Donnell, playing his son, are only 15 years apart in age. At times, they look more like brothers than father and son.
* ProductionPosse: Creator/PaulBlackthorne, Creator/ByronMann, Creator/KellyHu, Creator/SummerGlau, Creator/MichaelJaiWhite, Creator/SeanMaher, Creator/PeterStormare, Creator/BrandonRouth and Creator/NealMcDonough were all Creator/DCComics adaptation veterans.
* ProductPlacement:
** For Windows 8 and Windows Phone, everywhere.
** All of the laptops are made by Asus.
* RealLifeWritesThePlot [=/=] TheCastShowoff: [[Creator/SummerGlau Summer Glau's]] character, Isabel Rochev, was not initially going to be a villain, rather a red herring. However, Summer was dissatisfied about being in a superhero series without getting in on the action, so Isabel Rochev became the Ravager.
* ThoseTwoActors: Sadly averted as the abovementioned Sean Maher and Summer Glau ''played brother and sister'' in ''{{Series/Firefly}}'' but never even meet here.
* ThrowItIn: Every time that Ra's refers to Oliver as "boy", it's because Matt Nable went off-script. The producers left it in because they felt it worked with the character.
* WhatCouldHaveBeen:
** Justin Hartley, ''Series/{{Smallville}}''[='s=] ComicBook/GreenArrow, was considered to reprise his role back when the show was still being pitched. The higher-ups then decided that his rendition won't fit the DarkerAndEdgier tone of the series and amicably parted ways.
** Mr. Blank was originally supposed to be the DC Comics villain Onomatopoeia. However, as Onomatopoeia only speaks in, well, [[ExactlyWhatItSaysOnTheTin onomatopoeia]], they couldn't make it work without him coming across as mentally disabled (since sound effects sound far different in real life compared to comic books).
** [[spoiler: Malcolm was originally considered to be Oliver's actual father. The showrunners ultimately decided against it since it's too [[Franchise/StarWars "Darth Vader and Luke"]] so they gave the StoryArc to Thea instead. Still, this was given a DiscontinuityNod in the Season 3 finale when Malcolm tells Oliver that he always viewed him "as a son".]]
** The twentieth episode of Season Two was originally going to be a BackDoorPilot for a potential spin-off focusing on Franchise/TheFlash. Based on both the strength of Grant Gustin's portrayal of Barry Allen in "[[Recap/ArrowS2E8TheScientist The Scientist]]" and "[[Recap/ArrowS2E9ThreeGhosts Three Ghosts]]" and the fact that using the twentieth episode as a BackDoorPilot would interrupt the show's momentum as it built up to the season finale, the decision was made to make it a standalone pilot.
** [[spoiler: In early drafts of Season Two, Sara was originally going to take the role of Ravager, but eventually ended up as the [[ComicBook/BlackCanary Canary]]. Instead, the role of Ravager was given to Isabel Rochev]].
** The character who was going to buy out Queen Consolidated was originally going to be [[ComicBook/BlueBeetle Ted Kord]], a character whose existence was already implied through the appearance of Kord Industries. However, DC enacted an embargo on him due to "other plans", so the creators instead went with [[ComicBook/TheAtom Ray Palmer]]. This means that [[spoiler:the A.T.O.M. suit functions more like the Blue Beetle or Iron Man suits than it does its comic counterpart]].
** Before Matt Nable was cast, Creator/LiamNeeson said he'd play the show's version of Ra's Al-Ghul "in a heartbeat". WordOfGod states that after learning this, the network approached Neeson on the off chance he had the time, but they were unable to reconcile their schedules.
** There were plans to use ComicBook/HarleyQuinn past her initial unnamed cameo, but WB/DC put the kibosh on this after the ''Film/SuicideSquad'' movie was greenlit. Presumably this was due to the same reason shows like ''Series/{{Smallville}}'' and ''WesternAnimation/JusticeLeagueUnlimited'' were [[ExiledFromContinuity barred from using certain characters who were being highlighted in movies at the time]]. Willa Holland later commented on this, confirming that had Harley been allowed, she would have played a significant role in Season 4.
* TheWikiRule: [[http://arrow.wikia.com/wiki/Arrow_Wiki Naturally]].
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