* ActorAllusion:
** [[spoiler: Dr. Zola]] says that Natasha was born in 1984 as Creator/ScarlettJohansson was in real life.
** [[Creator/SamuelLJackson Nick Fury]] uses an advanced metal-cutter that operates like a [[Franchise/StarWars lightsaber]].
** Black Widow's quip [[note]]"I'm sorry, did I step on your moment?"[[/note]] to [[spoiler:Alexander Pierce]] seems to have been [[Film/PulpFiction borrowed]] from [[Creator/SamuelLJackson her superior]].
** The epitaph on [[spoiler: Nick Fury's]] headstone is inscribed with [[spoiler: the Bible verse [[Film/PulpFiction Ezekiel 25:17]]]].
** Steve replies to a joking jab at his [[ReallySevenHundredYearsOld age]] by Natasha [[note]]"Hey fellas, either one of you know where the Smithsonian is? I'm here to pick up a fossil."[[/note]] with a sarcastic [[Film/ScottPilgrimVsTheWorld "That's hilarious."]]
** One of the targets is [[Film/FantasticFour2005 the Baxter Building.]] Good thing the [[Creator/ChrisEvans Human Torch]] was busy playing at Cap.
** Pierce's refrigerator prominently featured a jar of [[Film/ButchCassidyAndTheSundanceKid Newman's Own Spaghetti Sauce.]] Creator/PaulNewman and Creator/RobertRedford were famous co-stars and friends, collaborating in several film classics such as ''Film/TheSting'' and ''Film/ButchCassidyAndTheSundanceKid''.
** One of the books on Steve's shelf is ''Film/AllThePresidentsMen.'' Robert Redford starred in the movie version.
** The Watergate Hotel is visible outside Pierce's office. Again, Robert Redford starred in the movie version of the ''All The President's Men'', about the Watergate scandal.
** Robert Redford being cast as the antagonist is an ironic allusion to him portraying the protagonist in ''Film/ThreeDaysOfTheCondor'', a film which influence on ''Captain America: The Winter Soldier'' is undisputed.
** Steven Culp plays a unnamed government official, likely a member of Congress, during a congressional hearing at the end of the film. He played fictional Speaker of the House Jeff Haffley on ''TV/TheWestWing''; perhaps they're even the same character.
* AwesomeDearBoy:
** In addition to SoMyKidsCanWatch (see below), Robert Redford wanted to be in this movie so that he could play [[spoiler:a villain]], since he almost never gets cast as one. Another reason he's mentioned is that he's never been in such a special effects-heavy movie before.
** One of the directors [[http://www.slashfilm.com/captain-america-winter-soldier-honest-trailer-proof/ has admitted to being a]] ''WebVideo/HonestTrailers'' fan and actually made it his mission to "Honest Trailer-proof" the movie. Turns out he ''succeeded'' [[https://www.youtube.com/watch?v=JvHyk2ESFCI since the Honest Trailer team admitted they had to resort to]] [[AccentuateTheNegative nitpicking for comedy's sake.]]
* CreatorCameo:
** Creator/StanLee, of course, as a Smithsonian guard.
** The film's screenwriters play two S.H.I.E.L.D. interrogators.
** Winter Soldier creator Ed Brubaker is one of the scientists attending to the character himself.
** Joe Russo, one of the directors for the film, appears as the doctor that treats Natasha [[spoiler:and Nick Fury]].
** Joss Whedon (who even directed TheStinger given it's a SequelHook towards [[Film/AvengersAgeOfUltron his next movie]]) is a patron at the Smithsonian.
* CastingGag: Robert Redford [[Film/ThreeDaysOfTheCondor is on the other side of the]] [[spoiler: government conspiracy]] this time.
* TheDanza: Georges St-Pierre plays Georges Batroc.
* DeletedScene:
** One of the first-revealed deleted scenes was a short, painful conversation between Natasha and Fury about his decision not to bring her in on his survival plan. Scarlett Johansson suggested it be cut because it disrupted the momentum of the film, and the basic gist of the scene is still conveyed without being needed to spell it out. Albeit, this scene also introduced the photo-veil, [[spoiler: the high tech mask that allow Natasha to impersonate the female councilwoman and enter the Triskelion]].
** One scene reveals a pragmatic reason why Steve ditches the S.H.I.E.L.D. version of the Captain America uniform, even towards the final confrontation (putting aside the symbolic reasons for using the WWII outfit). [[spoiler: After he escapes the assassination attempt in the Triskelion, HYDRA is able to track his location through a tracker installed in the suit. However, Steve appeared to know about it, and leaves it behind at a public gym for a set of sweats. The STRIKE team comes across it stuffed in someone's duffel bag.]]
** Another deleted scene was one of Maria Hill and Sitwell conversing after Cap's escape, ending with her being put under investigation because of her mild taunt that Rogers tends to inspire loyalty.
** The dialogue between Pierce and Natasha about potentially [[spoiler:leaking her past alongside the entire S.H.I.E.L.D. database]] ran longer, with a mention that [[spoiler:Pierce isn't doing anything to stop it because HYDRA's existence being known to the public won't matter once the Helicarriers are fully operational.]]
** A deleted scene that wasn't filmed was one of Hawkeye being sent to hunt down Steve, catching up to him and the two of them fighting. Steve wins, but finds Hawkeye whispering to him to make his defeat look real, revealing Hawkeye deliberately lost because a Quinjet is recording the whole thing overhead. He also alerts Steve about the tracking device in his suit.
** Another unfilmed scene was one taking place [[spoiler:after the reveal of HYDRA and computerized Zola. In it Zola would have explicitly been shown to survive by transferring his mind to a robot body, which promptly flees before Pierce's missile strike]]. It was cut out because the Russos felt uncertain about leaving such a major loose end hanging by the end of the film; however, the finished scene is ambiguous enough that [[spoiler:Zola could indeed return]] if they wanted to.
* DoingItForTheArt: Besides playing a villain, Robert Redford reportedly wanted to experience the new style of film-making that utilised high technology to bring its characters to life.
** During the highway battle between the Winter Soldier and Cap, the villain does knife flip to try and catch Steve by surprise. Reportedly, during all the days before the scene was shot, Sebastian Stan was seen flipping a toy knife until he could perform the action effortlessly.
* PlayingAgainstType:
** The Russo brothers are predominately directors of comedy, particularly episodes of cult favorites ''Series/{{Community}}'' and ''Series/ArrestedDevelopment'', and aren't exactly the obvious first choice to direct a superhero movie.
** Robert Redford joining a superhero film is not the kind of thing one would generally expect from him. [[spoiler: He also uncharacteristically plays the villain of the film]]. Heck, the directors have commented that, in an earlier age, the idea of Redford playing Captain America himself would not have been all that far-fetched. The directors' commentary notes that the style of the movie was inspired by '70s political thrillers, even referring to Redford's ''Film/ThreeDaysOfTheCondor'', who was the protagonist. In a way, ''The Winter Soldier'' is [[spoiler: Redford redoing the movie as the guy running a conspiracy instead of the agent being hunted, making this also an example of PlayingWithCharacterType]]
* ProductionPosse: Danny Pudi, who stars in the Russo brothers-directed ''Series/{{Community}}'', cameos as a S.H.I.E.L.D. technician. The firm who did all the openings for the Russos' shows was responsible for the end credits. Alison Brie was also in the mix to play Agent 13.
* PromotedFanboy: Anthony Mackie is a huge fan of the Falcon, and has gushed multiple times about how lucky he's been to get the role. He even expressed disappointment that his costume wasn't the character's classic red and white spandex. It's also heartwarming that one of the things he was emphatic about when joining the project was that he was playing Marvel's first African-American superhero.
* RealitySubtext: The actor playing Captain America was already good friends with the actors playing Black Widow and Falcon before any of them were cast.
** Creator/ChrisEvans and Creator/ScarlettJohansson have worked on three other movies together and their natural friendly chemistry and close working relationship applies very neatly to Cap and Widow.
** Likewise, Creator/ChrisEvans and Creator/AnthonyMackie were both in the same movie previously, but never worked together. According to Evans, they later ran into each other at the library, struck up a conversation, and just clicked as friends, which probably lends a little verisimilitude to Steve's and Sam's first meeting, too.
* SoMyKidsCanWatch:
** Anthony Mackie did the film so that his son and other African-American children can see that there are superheroes who look like them.
** Robert Redford said that the first thing that got him interested in the film was that his grandkids liked the movies a lot.
* StuntCasting: Batroc's moves are pretty convincing -- and that's probably because his actor George St. Pierre is one of the most respected names in MMA, three time welterweight champion of the UFC, and one of the top-ranked fighters in the [[BuffySpeak world, like ever]].
* ThoseTwoActors:
** This marks the fourth time Creator/ChrisEvans and Creator/ScarlettJohansson have appeared together, after ''Film/ThePerfectScore'', ''Film/TheNannyDiaries'' and ''Film/{{The Avengers|2012}}''.
** Also the third time for Creator/ChrisEvans and Creator/AnthonyMackie (previously appearing together in ''What's Your Number?'' and ''A Many Splintered Thing'').
** And the second time for Creator/ScarlettJohansson and Creator/RobertRedford (the latter previously directed and acted opposite the former in ''Film/TheHorseWhisperer'').
** Audiences get their first look at [[spoiler:Aaron Taylor-Johnson and Elizabeth Olsen as the MCU's Quicksilver and Scarlet Witch; they're the co-leads as husband and wife in ''Film/{{Godzilla 2014}}'', opening one month after ''Cap'']].
* WhatCouldHaveBeen:
** The film's writers hinted that had Coulson not died in ''Film/{{The Avengers|2012}}'' (or been given [[Series/AgentsOfSHIELD his own show]]), he might have taken Sitwell's place [[spoiler:as a HYDRA mole.]]
** The ''Series/AgentsOfSHIELD'' episode "Turn, Turn, Turn", actually turned this into a DevelopmentGag, by providing the idea that Coulson [[spoiler:may be a big part of HYDRA.]]
** Hawkeye had a role in the original script:
--->'''Joe Russo:''' What it was going to be, we were trying to complicate the relationship between Cap and his S.H.I.E.L.D agent friends. If Hawkeye got a call from S.H.I.E.L.D saying Captain America is a fugitive, would he listen to that call or not listen to that call? That sequence actually was heartbreaking for us to cut it. I think it ultimately might have been a conflict with Renner's schedule. But there was a great sequence where Hawkeye was chasing Cap through Washington D.C. there was an awesome sequence where they confronted each other in a ravine on the outskirts of D.C. and Hawkeye was shooting a series of arrows closing in on Cap, Cap closing in on him. And then Cap took him down and he realized for the first time that Hawkeye was trying to trick S.H.I.E.L.D, where he whispered something into Capís ear that Cap had a tracker on his suit and to punch Hawkeye to make it look real, because there was a Quinjet hovering above where they were watching the feedback back at S.H.I.E.L.D.
** Originally the opening to the film was going to be a wartime flashback of Steve Rogers fighting alongside Bucky and the Howling Commandos, ending with a reveal that it was AllJustADream, and Steve looking at a newspaper reporting of Dum Dum Dugan's recent death. It can be seen [[https://youtu.be/vfa-eQzkkcU here]]. This introduction would have presumably taken the place of the visit to the Smithsonian and the "End of the line" flashback scene.
** Baron von Strucker was going to be the BigBad of the film, rather than [[spoiler:Alexander Pierce]]. Clay Quartermain was also planned to appear, possibly taking Sitwell's place.
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