Throughout the game, a photographer takes your characters' pictures in various locales. These pictures are shown during the credits roll.
At one point in the game a character asks you (the player) to enter your name. Whatever name you enter appears at the end of the credits, as "Player: [Name here]", after the staff credits.
After defeating the final boss it is possible to continue traveling the world, talking to people. However, you can not save after defeating the final boss.