1. Sebastian Stan's contract with Marvel had him optioned for nine films, but according to him when production began for a sequel to Captain America: The First Avenger he first read about it in the trade papers and so, as he hadn't been contacted, he believed his character of Bucky Barnes would not return for this film.
Eventually he did get the call, but once again he was kept in the dark and only discovered he was playing the title role of Winter Soldier when the movie's name was formally revealed at San Diego Comic Con 2013.
2. When Christopher Markus and Stephen McFeely finished their first draft of the script for Captain America: The Winter Soldier, Hawkeye was included among the ensemble. However they both felt that "he didn’t have enough to do and suddenly it seemed like we were giving him short shrift". That's so Hawkeye, right?
Markus & McFeely instead decided to write a small scene in which Hawkeye and his whereabouts are mentioned, which was shot, but ultimately wasn't included in the released film.
3. As a nod towards Clint Barton, Natasha Romanoff can be seen wearing a necklace with an arrow on it. This was in fact Scarlett Johansson's idea, playing up their characters romantic status.
4. Before Frank Grillo was cast, Nikolaj Coster-Waldau, Kevin Durand and Josh Holloway screen-tested for the role of Brock Rumlow/Crossbones.
5. Emilia Clarke, Teresa Palmer, Jessica Brown Findlay, Alison Brie, Imogen Poots, Anna Kendrick, Felicity Jones, and Mary Elizabeth Winstead were all considered for the part of Kate/Agent 13/Sharon Carter before the role went to Emily VanCamp.
Another actress who also auditioned for the role was Elizabeth Olson, and it was this audition that really brought her to Marvel's attention, earning her the part of Wanda Maximoff/Scarlet Witch in The Avengers: Age Of Ultron (and making a cameo in the mid-credits scene of The Winter Soldier).
6. It's always easy to spot Stan Lee in Marvel movies, but you may have missed some of the other cameos included in The Winter Soldier...
- Ed Brubaker, the author of the original 'Winter Soldier' comic book series, appears as a bespectacled technician brainwashing Sebastian Stan in the bowels of S.H.I.E.L.D..
- Joss Whedon can be seen wearing a captain America T-shirt and going down the escalator with a little boy at the Smithsonian.
- Finally, and this one's not exactly a cameo but rather an image of the actor, keep your eyes peeled at around 1:53:45 for Robert Downey Jr. who is briefly visable in the far right of the screen when the helicarriers are locking on to the new Avengers Tower.
7. Different versions of Steve Roger's "Catch-up" list were created for many of the different countries Captain America: the Winter Soldier was released in.
- The regular US version includes I Love Lucy, Moon Landing, Berlin Wall (Up + Down), Steve Jobs (Apple), Disco, Thai Food, Star Wars(crossed out)/Trek, Nirvana (Band), Rocky (Rocky II?) and Troubleman (Soundtrack).
- The UK version changes a few things including The Beatles, Sean Connery, World Cup Final (1966) and TV Show - Sherlock.
- In Italy Cap's list mentions Vasco Rossi, Ferrari's victories at F1 Grand Prix and Roberto Benigni. The French version mentions the 1998 World Cup, Louis de Funès, Coluche, The Fifth Element and Daft Punk.
- In Russian territories Steve needs to catch-up with Yuri Gagarin, Vladimir Vysotskiy and Moscow Does Not Believe in Tears.
- The Brazilian version lists Wagner Moura, Ayrton Senna, Xuxa Meneghel and Mamonas Assassinas.
- The South Korean version mentions Oldboy and soccer player Ji Sung Park.
- The Spanish version includes tennis player Rafael Nadal, Chupa Chups, Héroes del Silencio, 1978 Constitution and Camilo José Cela.
- The Mexican version mentions Nobel Prize winner Octavio Paz and astronaut Rodolfo Neri Vela.
- Finally the Latin American catch-up list includes Maradona's Hand Of God and Shakira!
8. Natasha Romanoff briefly mentions a Canadian agency called Department H, this was the organisation which experimented on Wolverine and gave him his Adamantium-bonded skeleton in the Marvel comics.
9. Nick Fury's tombstone contains a quote from Ezekiel 25 :17, which just happens to be his famous line in the film Pulp Fiction when he stood alongside John Travolta in the scene where they went to collect a briefcase for Marcellus. "The path of the righteous man..."
10. The script detailed a scene where, while the ballistic missiles are coming for him, Dr. Arnim Zola (Toby Jones) transfers his current computer consciousness into a headless robot (like the comics) and makes an escape. The blueprint plans for his new 'body' were briefly teased in Captain America: The First Avenger (above), but unfortunately due to the shoot on the sequel overrunning this scene was scrapped at the last minute and never filmed, and so along with his computer set-up he was seemingly destroyed.
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