Originally Posted by Nausicaä

Bad Ending: Er, yeah, the world blows up.
Normal Ending: The 3 guys have a speech (a rather lengthy one about peace and stuff, and they talk about the trio), then you see the 3 girls fly off. Kinda dumb ending, to me.
Good Ending: Tidus returns, the good stuff. Tidus swims back up, swims to shore, sees the Celcius flying towards him, Yuna jumps out, hugs, a small conversation, then interrupted by Wakka + a crowd. A few shots of Rikku and Paine looking happy, then Yuna and Tidus runs towards the shore, in which the camera then zooms out and ends up viewing the sky and the gull on the Celsius.
Perfect Ending: 100% complete, the Zanarkand scene add-on to the good ending. That is the push-in-water scene.