Here's an interesting bug. During the sequence when Terra is calling out to the espers in the cave, if you do enough damage to Kefka and he lies down (instead of kneeling for example), then the game transports you directly to the WoR but the overworld is screwed up. You can sort of walk around but it doesn't seem possible to enter anywhere. You can fly around with the WoR airship but using the menu while flying crashes the game. Resetting takes you back to the event where the door opens. If you stand in front of Terra the game crashes, if you try to leave the event repeats and you go back to the even more screwed up WoR.
EDIT: This bug doesn't happen in the latest version.
EDIT: This bug doesn't happen in the latest version.