There are unused voice clips for Ryo, Robert, and Yuri that likely relate to the game's climax where Yuri reveals the identity of Mr. Karate.
Contributed by DrakeVagabond
The in-game announcer mentions the stage name and number while in-between levels. It does this for every stage except for the first one, since the map isn't shown when the single-player starts. However, the game does have a sound clip for the very first stage that is never used.
Contributed by DrakeVagabond
While the whole cast has visible head damage, King was originally planned to be the only character with chest damage. Some of the animations were seemingly complete before the feature got removed; her famous undressing KO" feature seems to be a leftover from it.
Contributed by DrakeVagabond
While Ryo and Robert are the only fighters playable in 1-player mode, there are still "time over" animations for the Initiate Super Death Blow bonus stage for each character.
Contributed by DrakeVagabond
Attachment
Hidden within the game's data is a chibi portrait drawing of the game's cast. It is unknown if this picture can be displayed during normal gameplay.
Contributed by DrakeVagabond
Ryo's design is based on Ryu from Street Fighter. Since the game's creator, Takashi Nishiyama, also created the first Street Fighter game when he was employed at Capcom, the character was made as a homage to the series he created.
Contributed by DrakeVagabond
Robert's design is based on actors Steven Seagal and Andy Garcia, and the character James Crockett from the Miami Vice series. The character artist, Shinkiro, expressed difficulties in designing Robert on the count of not knowing how rich people behaved.
Contributed by DrakeVagabond
While most versions of Art of Fighting end on a cliffhanger just before Yuri reveals the true identity of Mr. Karate to Ryo and Robert, the Super Nintendo version extends the ending to reveal that Mr. Karate is Ryo and Yuri's father Takuma, who was blackmailed by Geese Howard and Mr. Big into killing Jeff Bogard (Father of Terry from Fatal Fury)
Contributed by MightyKombat
Attachment
If a player finishes off King with a special or super move in round two, it will shred his shirt, revealing that he is female. This was removed from the SNES version.
Contributed by gamemaster1991