Avoid Desertions
If you are tired of listening to your generals to see if they may desert in the next round, try this. Leave yourself some awards, save the game, select DONE in the Domestic Mode. Your chancellor will tell you who left your troops. Now simply remember these names and restart the game by pressing A + B + C + Start.
Start the saved game, promote the 'disloyal' characters and they won't desert. If you have no awards left, you can donate a Faith Coin to them. This is also useful if you need to save your awards (and soldiers) for your main fighting characters.

Mercenaries and thiefs normally get unhappy if they were used in combat and get no awards afterwards. To prevent them from desertion, deploy them to far-away castles for potato planting, but don't let them fight. They will not make trouble any more.

Bloopers
For an audio treat, listen to the bloopers that occured while recording the voices in Dragon Force. To do this, beat the game, then watch the credits. Then at the "Fin" screen, wait about 5 minutes. After that the bloopers will start automatically.

Control the Zombie
To make the Zombie fight for you, send some of your intelligent fighters (INT => 70) to the towns Magicka or Stalwart. Here you will find more than enough Spirit Crests to recruit the Zombie.

Debug Mode
When the "Press Start" screen appears, hold L + R + X + Z and press Down, Down, Up, Down, Down, Left, Left, Left, Up, Down, Right, Right, Right, and Start. If done correctly, you will hear an error bleep and the words "Debug Mode" will appear on the bottom of the screen.
WARNING! This code can crash the game.

Don't Let the Bosses Escape
If you fight one of the main generals (LEON, JUNON, REINHART, TEIRIS, WEIN, GONGOS, or MIKHAL) make sure that they have no castles left. Even when being captured during a struggle, they normally escape to a castle which belongs to their kingdom. With no hideout left they are forced to stay