Many characters that appeared in Dissidia 012 were originally supposed to be in Dissidia. These characters, left out for unknown reasons, were Vaan, Kain, Lighting, Yuna and Prishe.

In the cut-scene where Cloud fights Sephiroth (Destiny Odyssey VII), several shots are recreated from previous titles.
• The scene where Cloud and Sephiroth cross swords is similar to the scene from Crisis Core in which Sephiroth and Cloud battle in the Nibbleheim Reactor.
• After being knocked back, Cloud descends towards Sephiroth who then knocks Cloud back into the air. This is similar to Sephiroth's first appearance in Advent Children.
• After Cloud lands, the camera pans across Sephiroth's Masamune up to his face, similar to another scene from Advent Children.
• At the end of the scene where Cloud and Sephiroth face off, their poses are similar to their final battle from Final Fantasy VII.

Dissidia Final Fantasy was originally planned as a Kingdom Hearts spin-off, but Disney did not approve of their characters fighting each other.

There are 3D models for both Aeris and Tonberry in the game's data that are never used. Aeris may have been considered as an assist character, considering she appeared in Dissidia 012 Final Fantasy.

It's usually impossible to use Chaos as a playable character, however it's possible to play as him with the use of cheat codes.

During "Dissidia Final Fantasy NT: Behind the English voice cast" with Natalie Lander (Terra Branford's English voice actress), Natalie explained that she wanted to honor Yukari Fukui (Terra's Japanese voice actress) by mimicking her sound quality for her character's voice.