* ActorAllusion:
** [[spoiler: Dr. Zola]] says that Natasha was born in 1984 as ScarlettJohansson was in real life.
** [[SamuelLJackson Nick Fury]] uses an advanced metal-cutter that operates like a [[Franchise/StarWars lightsaber]].
** And has to deal with a [[Film/SnakesOnAPlane snake-themed organization and planes]].
** The epitaph on [[spoiler: Nick Fury's]] headstone is inscribed with [[spoiler: the Bible verse [[Film/PulpFiction Ezekiel 25:17]]]].
** [[spoiler: Baron Strucker]] is played by Thomas Kretschmann. [[Film/ThePianist This is]] [[Film/{{Stalingrad}} far from]] [[Film/{{U571}} his first]] [[Film/{{Valkyrie}} appearance as a]] [[{{Film/Downfall}} Nazi officer.]]
** Robert Redford's Pierce worked in [[Film/ButchCassidyAndTheSundanceKid South America]] and his office overlooks [[Film/AllThePresidentsMen The Watergate]].
*** [[spoiler: His ultimate goal is to create a utopian prison, wherein the prisoners believe they have attained complete freedom within their confines - a goal similar to that of the man he biopiced in the film ''Brubaker'']].
** 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 factors that [[spoiler:Project Insight's algorithm]] monitors is the SATs. ChrisEvans and ScarlettJohansson have [[Film/ThePerfectScore contended with the SATs before]].
** One of the targets is [[Film/FantasticFour the Baxter Building.]] Good thing the Human Torch was busy playing at Cap.
* 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.
* TheCameo[=/=]CreatorCameo:
** 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 at the character's flashback.
** Joe Russo, one of the directors for the film, appears as the doctor that treats Natasha [[spoiler:and Nick Fury]].
* TheDanza: Georges St-Pierre plays Georges Batroc.
* DoingItForTheArt: Robert Redford stated that he wanted to do the film because he wanted to experience the new style of film-making that utilised high technology to bring its characters to life.
* HeyItsThatGuy
** Captain America finds a new trusty NCO in [[Creator/JeremyRenner Hawkeye's]] [[Film/TheHurtLocker old friend ]] [[Creator/AnthonyMackie Sgt. Sanborn]], who was also friends with [[Creator/HughJackman Wolverine]] in ''Film/RealSteel''.
** UFC fighter Georges St. Pierre decided to trade in his fighter's mitts for some acrobatics so he can fight Cap.
** [[{{Series/Revenge}} Emily Thorne]] joined SHIELD and might be Peggy Carter's niece.
*** One wonders if [[{{Everwood}} she's still together with Ephram]].
** Jack Rollings and Crossbones [[Film/ZeroDarkThirty killed Bin Laden]]. Starlord was there, too, but that's irrelevant.
** [[{{Series/Community}} Abed]] continues to have his own little side adventures being an employee of SHIELD.
** [[Series/OnceUponATime King George]] is a World Security Council member.
*** Good to know [[Series/{{Lost}} he's not antagonizing Ben Linus]] any longer!
** [[Film/TheDarkKnight Lau]]/[[Series/{{Arrow}} Frank Chen]] switches comic book universes and appears as another WSU member.
** Grace and Film/TheHorseWhisperer have a tense reunion.
** Apparently, [[{{NCIS}} the very first director of NCIS, Tom Morrow]], got promoted so far that he's now in the ''World Council''.
* HeyItsThatVoice: The AI in Nick Fury's car is [[Franchise/StarCraft Jim Raynor]].
** And the narrator of the Smithsonian's Captain America Exhibit is Gary Sinise, best known for playing [[{{Film/ForrestGump}} Lt. Dan.]]
* LateArrivalSpoiler[=/=]ItWasHisSled: Given that the identity of the Winter Soldier is so well known, marketing makes no attempt to hide it. The film isn't especially careful about concealing the Soldier's identity from the audience either (after he loses his goggles and mask he doesn't replace them). The primary emotional beats come not from his identity being revealed to us, but to Steve.
* 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]].
* ProductionPosse: Danny Pudi, who stars in the Russo brothers-directed ''Series/{{Community}}'', cameos as a SHIELD technician. 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.
* 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 he's George St. Pierre, 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 ''ThePerfectScore'', ''TheNannyDiaries'' and ''Film/TheAvengers''.
** Also the third time for Creator/ChrisEvans and Creator/AnthonyMackie (previously appearing together in ''What's Your Number?'' and ''A Many Splintered Thing'').
** 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/{{Godzilla2014}}'', opening one month after ''Cap'']].
* WhatCouldHaveBeen: The film's writers hinted that had Coulson not died in ''Film/TheAvengers'' (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.]]