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Final Fantasy Part 2 - Did You Know Gaming? Feat. ProJared
 
Auron's voice actor, Matt Mckenzie, is also the voice of Major Elliot from Final Fantasy: The Spirits Within.
Contributed by theManBearBrig
Final Fantasy X, like other games in the series, features many references to real world religions and their history. This game in particular alludes to the conflicts between Christianity and Gnosticism; it also depicts the corruption possible within organized religion, and how it can lead to an inversion of its own doctrine.
Contributed by SonicManEXE
During the fight with Spoiler:Seymour Omnis inside of Sin, summoning Anima will provoke a response from Seymour, "You would oppose me as well? So be it." He says this because Anima was formerly his final aeon, as well as his mother.
Contributed by Outofmind23
When you talk to the woman taking care of the Chocobos at the bottom of the ship during the sea voyage to Kilika, she will sing a part of the Chocobo Theme.
Contributed by Pogue-Mahone
Cloud's Buster Sword was originally intended for use by Tidus but was removed before the game was released. It is still in the game's code, though, and using hacking tools, it can be obtained and used in the final version.
Contributed by Shadowmane
Lulu's dress in Final Fantasy X was designed by Tetsuya Nomura specifically to see if the graphic designers could keep the exact number of belts in the right places every time. This is why many cutscenes with her show Lulu from the waist up or from behind.
Contributed by Shinitenshi
In Tidus's early development, he originally had darker colored hair. It was changed, most likely because his name means "Sun" in Okinawan, and the developers wanted the color of his hair to reflect that.
Contributed by Shinitenshi
Character designer Tetsuya Nomura has said that the South Pacific, Thailand and Japan are major influences on the culture and geographical design of Spira, particularly in the case of the southern islands of Besaid and Kilika.
Contributed by Dazz
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Lulu's starting weapon, a Moogle Doll, is the only appearance of a Moogle in the game, a massive difference from all previous titles in the series. Her other weapons are references to previous characters in the series, including her final weapon of the Onion Knights from Final Fantasy III.
Contributed by Dazz
Final Fantasy X was the first core Final Fantasy title that wasn't entirely composed by Nobuo Uematsu. The score was also created by Masashi Hamauzu and Junya Nakano.
Contributed by Dazz
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At the end of the game Yuna will proclaim to Tidus that she loves him. However in the Japanese version Yuna will simply thank him. This change was to make up for cultural differences.
Contributed by Dazz
Tidus is never actually directly referred to by his name in audible dialogue. People will refer to him with impersonal pronouns. This is due to the player being able to name Tidus at the start of the game, and this being Square Enix's first voiced Final Fantasy game, they weren't sure how to handle a variable name. Tidus' name pronunciation has been debated, but was confirmed to be pronounced "Tee-Dus" by James Arnold Taylor, the voice actor for Tidus.
Contributed by Dazz
There is an unused female version of somebody humming the Hymm of the Fayth, as hummed by Tidus during the game, on the game's disc. It is unknown who the voice could be.
Contributed by Dazz