Final Fantasy allusions

Final Fantasy Series

 * The bonus dungeons in the Soul of Chaos release feature several bosses from the later Final Fantasy series.
 * Most of the random names that can be chosen for the Light Warriors in the later releases are allussions of characters in the Final Fantasy Series

Warrior

 * King Giott, from Final Fantasy IV, is one of the random names.

Monk

 * Maduin is a random name, being an allusion to the creature with the same name.

Black Mage

 * Vivi, from Final Fantasy IX, is one of the possible random names.

Zelda series

 * In Elfheim the player can find a gravestone with text "Here lies Link". Link is the hero of the Zelda series of games, who resembles an elf.

Dungeons & Dragons

 * Many enemies are modelled directly after their counterparts in Dungeons & Dragons.
 * Notably the Evil Eye, which had to be censored in order to avoid a lawsuit.