Enter the ship, hold A and press B(55). Arrange the tiles in order from 1 to 15 to collect 100 Gold.
Find the three tombs located next to the white magic shop in Elfland. The tombstone farthest to the left reads:
"Here lies Erdrick"
"873-866"
"R.I.P."
This is a direct reference to a character in the game Dragon Warrior.
Northeast of the port town of Provaka is a two space wide peninsula with enemies from the Northern Continent. They offer a lot experience and are difficult to defeat unless you are around levels 12 or 13.
The location of the Adamant needed for Excalibur is in the tower in the sky -- you need the chime and the cube. Go in the tower and continue to the place with eight ways to travel. Go in the bottom left diagonal and fight the enemy that guards it. Open the treasure chest to get the Adamant.
In the first castle entered in the game, Castle Coneria, above Queen Jane's room is what appears to be a room with no one inside. Search around the room a bit, however, and you will realize that you can talk to someone although they are not there. After you rescue the princess, the message will change.
In Elfland, just beside the White Mage shop, there are three tombstones. Two of them are ordinary tombstones, but the one on the left is different. It is the tomb of Erdrick. Erdrick is a character from Dragon Warrior, another very popular game series produced by Enix. In the Japanese version of FF1 (and in PSX's Final Fantasy Origins), the tomb says ''Here lies Link'' instead. Link, of course, is the hero of the Legend of Zelda series.
In the first castle, there is what appears to be an empty space right above Queen Jane's room and below the person going right and left. Check the lower right corner of this area to find out that there is an invisible person here. Talk to him and he will tell you something before and after you save Princess Sarah.