I don't know if this has been reported already, but it's not in the walkthrough so I'll add it anyway.
In the early stages of the game, just after you repelled Dario's first attack on Razril, you are free to wander a bit until you go to bed. If you go on the docks and talk to the soldier who guards your ship, he will let you board it and use it, but he will also give you a Giant Bird's Feather.
He tells you to give it on his behalf to a girl, but I didn't do it so I don't know if this has any effect.
Anyone knew about that?