Final Fantasy X is the first game in the franchise to feature full voice acting. However, as in its predecessors, the player is allowed to change the main character's name at the start of the game. For this reason, Tidus is never referred to by name by any of the other characters. In the sequel he is simply referred to as "him," by characters when referring to Tidus.
The majority of the English dialogue was not based to the actual game footage; the only guidance the voice actors had were samples of the original Japanese dialogue, and they rarely had the opportunity to sync their dialogue with actual footage. Once the voice recording was complete, sound editors would digitally speed up or slow down the audio clips in order to fill the character's allotted speaking time for each particular line.
When the party arrives at the city of Luca, the music playing in the background is "Brahne Appears - The Play Begins", which was the opening theme to the play "I Want to Be Your Canary" performed by Zidane's group Tantalus in Final Fantasy IX.
The lyrics to the Hymn of the Fayth ("Ieyui, Nobomeno / Renmiri, Yojuyogo / Hasatekanae / Kutamae") are made up of Japanese syllables that, when deciphered, translate in English to "Pray to Yu Yevon / Dream, Fayth / Forever and ever / Grant us prosperity".
In the Ainu language, Tidus means "sun", Wakka means "water", and Yuna means "moon, flower".