Final Fantasy Origins/New features

There are many differences between the originals and Origins.

Final Fantasy I

 * Graphics and audio have been updated and are on par with SNES games.
 * Numerous bugs have been fixed so spells actually work and equipment that was supposed to be strong against certain species and elements actually are.
 * A new FMV sequence has been included, replacing an in-game sequence.
 * HP losses/gains are now displayed next to the character, rather than in text boxes below the action.
 * Various music pieces have been replaced with new tracks.
 * Remodelled menus with controller shortcuts have been added.
 * The game can be saved anywhere, not just on the world map. (This is only a temporary save to the PS1's RAM, you have to go to an inn/use an item to permanently save to a memory card).
 * You can save up to fifteen different games per memory card.
 * Expanded dialog to help explain and enhance the plot.
 * The game has been completely re-translated from the original Japanese (rather than just copying the NES text). As a result:
 * Full names are now used (so "Cure 4" instead of "Cur4", "Excalibur" instead of "Xcalbur", and so on).
 * More accurate names (no more Wizards that can't use magic), and items/equipment/monsters that are based on mythology have the actual name.
 * Modernized naming conventions ("Dispel" instead of "Xfer").
 * Auto retargeting prevents characters from attacking nothing if their selected target is already dead. (optional setting)
 * Equipment is now stored in the common item menu, rather than each character holding equipment even if they are not using it. This means you can hold more equipment and any character can use any equipment as an item if it is unequipped.
 * You can use revival items during battles. (optional setting)
 * Beating the mini-game earns you 10,000 Gil.
 * Easy mode (Normal mode is still available)
 * Reduced prices (about 2/3 of the original)
 * Faster leveling up
 * Increased stats after a level up (especially MP)
 * Items can now be bought and sold in bulk, rather than one at a time. Stores are also actual rooms, rather than just the dialog screen.
 * You can now run in towns and dungeons. This does not affect the enemy encounter rate. (optional setting)
 * Encyclopedias of items, enemies, and places, as well as records of audio and visual files. (Unlocked as you go through the game.)
 * The grave in Elfheim now belongs to Link from The Legend of Zelda instead of Erdrick from the Dragon Warrior series.
 * Alas, Garland will no longer threaten to knock you down.

Despite all of these changes, the game can pretty much be played as the original if you really want. Most of these changes:
 * Are irrelevant to the gameplay (graphics, audio, expanded dialog, FMVs, etc).
 * Can be disabled (dash, auto-retarget, revive during a battle)
 * Can simply be not used (quick save, easy mode, the mini-game, etc.)

The only thing that can't be changed is the pooled items. That said, Origins is a bit easier than the original due to the bug fixes. Most of the bugs in the NES version worked against you, so you are a tad bit stronger.

Final Fantasy II

 * Like Final Fantasy I, an FMV sequence has been added, the graphics and audio are updated, your party can run, and your character will auto retarget.
 * Combat is more balanced: Your accuracy is much higher and status ailments are far less effective.
 * Unique music for each boss replaces the generic boss music.
 * Aside from the graphical update, various sprites have been redesigned.
 * The maximum number of items is now 63 (it was 32 in the original).
 * Icons denote items, equipment, and spells.
 * Encyclopaedias of items, enemies, and places have been added. (Unlocked as you go through the game.)