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Super Street Fighter 2 HD Remix started out as a remake of Street Fighter Alpha 3. Lead designer David Sirlin felt that Alpha 3's large roster would make the development process more difficult. He also believed that the game's lack of approval by the hardcore community would harm the game's sales, so he pushed Capcom so that they could work on SF2 instead.

David Sirlin also confirmed that the development team scrapped 2,500 animation frames in development because they weren't satisfied with how they turned out.
Contributed by ZpaceJ0ck0
The team originally wanted to introduce special KO animations depending on how the player finished off their opponent. The only remnants of this feature are a special KO if the player's character is defeated while guarding against a hadouken.
Contributed by ZpaceJ0ck0
Zangief's headbutt move was originally more elaborated, originally being a throw in which Zangief sent the opponent straight into the air and would then headbutt them on the way down. It was cut due to issues implementing the attack.
Contributed by ZpaceJ0ck0
Chun-Li originally had a back flip attack, but it was cut due to being too strong and the team not having enough time to adjust it. However, sprites for the move still exist in the game's data, and it was later implemented in SFII: Champion edition.
Contributed by ZpaceJ0ck0
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Two non-playable fighters are shown during the opening scene of Street Fighter II: World Warrior. One punches the other, followed by the screen scrolling up a skyscraper to display the game's logo.

The fighters' names were revealed to be Max and Scott as part of Street Fighter V's "Shadaloo Activity Report" on Capcom's Japanese website.
Contributed by Kakariko Kid
NSFW - This trivia is considered "Not Safe for Work" - Click to Reveal
In the Super Famicon version of the game, a man in a blue coat and hat can be seen in the background of Ken's stage moving his hand up and down in front of his crotch. This was changed in international versions due to the movement making him look like he is masturbating.
Contributed by MeleeWaluigi
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On the arcade version of "Super Street Fighter II: The New Challengers", Cammy's ending has an error in her dialogue, her line reads; "WAIT! IF WHAT HE". The end of the line is supposed to read "SAYS IS TRUE...", but it was cut off, even though the whole sentence is still inside the data.

This was corrected in "Hyper Street Fighter II", but with a comma instead of ellipses.
Contributed by ProtoSnake
Some fans have pointed out that Ken's theme sounds similar to the Cheap Trick song "Mighty Wings" from Top Gun. Street Fighter 2 composer Yoko Shimomura stated in a interview: "I have heard people say that, and I watched the movie before I composed the song, so I can't deny I may have been inspired subconsciously. But I didn't go into it thinking, 'OK I'm gonna make this song sound like Mighty Wings.'"
Contributed by ZpaceJ0ck0
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On the arcade and Genesis versions of Super Street Fighter II: The New Challengers, Chun Li's ending shows her punching a man with blood spraying from his mouth. In the SNES version the blood was recolored to censor it.
Contributed by ProtoSnake
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In Zangief's ending on the arcade and Genesis versions of "Super Street Fighter II: The New Challengers", there's a close-up of ex Soviet President Michail Gorbatschow's face, but it was removed on the SNES.
Contributed by ProtoSnake
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In the arcade and Genesis versions of Super Street Fighter II: The New Challengers, Balrog's quote when he wins is "My fists have your blood on them.", but on SNES, this was changed to "Get up you wimp!".
Contributed by ProtoSnake
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In the arcade and Genesis versions of Super Street Fighter II: The New Challengers, characters' defeated portraits show blood and gore. This was removed in the SNES release.
Contributed by ProtoSnake
The idea of Street Fighter II Turbo: Hyper Fighting came about as a result of Capcom USA's James Goddard testing the counterfeit "Rainbow Edition" at an arcade to see if it represented a serious threat. He was initially unimpressed by the poor balance, but Champion Edition "felt like it was underwater" after experiencing the faster pace of the counterfeit.
Blanka's Rolling Attack's command was originally charge down, then forward. This felt wrong, as it was different from the rest of the game's commands, and so it was changed.
Contributed by Cavery210
In the Japanese versions of Street Fighter 2, advice is given to the player on the continue screen. The developers originally considered having a mysterious old man give the advice, but never decided on a design for him, and so the idea was dropped.
Contributed by Cavery210
It was initially planned for special moves to do more damage the quicker the command was entered.
Contributed by Cavery210
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Akuma has two different endings depending on whether the player beat M.Bison or Shin Akuma. The text in both endings was removed in releases of the game outside Japan.
Contributed by Cavery210
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In every Street Fighter II version in which Vega can be selected as a playable character, the Spanish flag seen in the character select screen is the one that was used during the militar dictatorship of Francisco Franco (1939-1975).
This game was released in 1991, 16 years after that flag was declared unconstitutional.
Contributed by Gallego13
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In the first three versions of Street Fighter II, "World Warrior", "Champion Edition" and "Hyper Fighting", Ryu and Ken's Hadoken sprites would sometimes appear orange. Developer Akira Nishitani confirmed that this was added as an Easter egg, and wasn't a glitch as previously thought.

In later versions of the game, starting with "Super Street Fighter II: The New Challengers", Ryu would receive a legitimate orange Hadoken special move called "Shakunetsu Hadoken"
Contributed by MightyKombat
In the original arcade version, Ryu had a winning quote that said, "You must defeat Sheng Long to stand a chance." This was a mistranslation that should have said "You must defeat my dragon punch to stand a chance." Sheng Long has become a running joke with Capcom that has turned into the characters of Akuma and Gouken
Contributed by gamemaster1991
In Japanese versions of Street Fighter II, M. Bison is called Vega, Vega is called Balrog and Balrog is called M. Bison. This was to avoid any issues over naming Balrog, the boxer, a name very similar to that of Mike Tyson.
Contributed by IkiFoo
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In Super Street Fighter II: The New Challengers, there is an unused graphic in the game with the name "Sarah". This may have been Cammy's early name.
Contributed by Ghost
The "Combo" system developed for the game was a bug. A bug in the game's code enabled the player to "cancel" during the animation of some moves by performing another move, allowing for a combination of several basic and special moves. This "combo" system was later adopted as a standard feature of fighting games, and was expanded upon in subsequent Street Figher installments.
Contributed by DidYouKnowGaming