Ambos

Há provavelmente elementos mais comuns, mas eu acho que o principal óbvio é Dr Sid (que é o nome escrito com um S em vez do tradicional C ) está presente.

Em termos de nome de marca, o seguinte é citado de uma entrevista com Motonori Sakakibara , co-diretor de Final Fantasy: The Spirits Within (ênfase minha):

Q: With very few films based on computer games doing well at the box office normally, in retrospect, do you think the film could have performed better if it had not been associated with the games?

A: I really can't say. One can speculate on a lot of theories as to why the film didn't do well, but as far as association with the game, I was producing the film without having that in mind, but because Mr Sakaguchi is really the creator of Final Fantasy, and he is just so strongly associated with the game it just became a natural progression that this movie was named after it and became what it was, which is Final Fantasy the movie. I guess as my motivation wasn't to turn the game into a film, I really can't say whether if we hadn't done that it would have done better.

...

Q: Many fans of the Final Fantasy gaming universe were upset because there were very little fantasy elements in the film (such as magic, monsters etc). Can you comment on why these elements didn't appear?

A: One of the reasons goes back to my previous comment on the whole game to movie thing, where we didn't initially sit down and say let's turn the game into a movie. I guess the idea of the project was elsewhere, in that we wanted to push the technological envelope further for computer graphics, and show off Square's skill and the artists' skill on the big screen in Hollywood. So we didn't start out saying, OK, here's a game and we're going to put it on the big screen.

Note-se que o Sr. Sakaguchi também é o diretor deste filme, portanto, onde o título Final Fantasy é provável que tenha se originado. E como se pretendia que fosse um filme independente, não deveria haver muitos elementos comuns nos jogos.