The Masamune weapon has a 40% combo rate, identical to the critical rate of the weapon in the original Final Fantasy. This is especially significant because the Final Fantasy weapon only has this critical rate due to the critical hit bug, which appears to have been deliberately preserved in all later Final Fantasy remakes. By assigning this stat to the Final Fantasy XII weapon, the "bug" is perpetuated further.
The second page for the bestiary entry of the enemy Wild Onion is a message from an Onion Knight named "Nakhiro". In addition, the Onion Queen's second bestiary page elaborates on the Final Fantasy lore and the meaning of the onion within the series. Onion Knights first appeared in Final Fantasy III.
In Rabanastre, just outside Migelo's Sundries, a bangaa talks of his seeq friend counting things (originally cobblestones). However, at one point in the game he says this: "My friend says that o'er 430 revelers came through the Southern Plaza during the big fete! But even if you count the bards... 'Course, he could be countin' the spoony bards, too. That would be another matter altogether". This is a direct reference to the "You Spoony Bard!" quote by Tellah the Sage.
The Esper Zeromus is based on the final boss of Final Fantasy IV, Zeromus.
The Babil enemy is reference to the Giant of Babil, as "When they descend to the earth from their home in the heavens, they strike swiftly, and with malice apparent", where the Giant of Babil is a powerful weapon that is used for destruction.
The elite mark Gilgamesh and his partner Enkidu first appeared in Final Fantasy V. He bears replicated weapons similar to those used by the protagonists of five other Square Enix games. During the battle, the iconic theme "Clash on the Big Bridge" plays.
The two copies of the Tournesol, the game's second strongest greatsword, are actually Gilgamesh's versions of Excalibur and Excalipoor. They almost look the same as the Tournesol, but they feature a sun (Excalibur) and a moon (Excalipoor) on the hilt. This is a reference to the Excalibur and Excalipoor in Final Fantasy V, the game where Gilgamesh first appeared, although the more detailed appearance of the weapons with the sun and the moon on the hilts could only be seen in artwork shown in strategy guides.
The Esper Exodus is directly based on Exdeath, the main antagonist of Final Fantasy V.
Clio, head of Clio's Technicks in Bhujerba, is likely named after Mr. Clio from Final Fantasy V's Merged World.
The superboss Yiazmat's description may be a reference to the lord dragon Shinryu: both are feared even by the gods who created them. Omega and Shinryu often appear as superbosses in the same game, a tradition started in Final Fantasy V.
Earth Tyrant's bestiary entry mentions him as a member of "Eight legendary Wyrms of great Power". Earth Tyrant may be a reference to the Earth Dragon from Final Fantasy VI, a member of the Eight Dragons that had the appearance of a T-Rex.
The Buer enemy refers to the Buel enemy that originally appears in Final Fantasy VIII, first appearing on the Fire Cavern, a habitat coinciding with the one on the bestiary description of this incarnation.
The Lindwyrm shares the same etymological origin as Lindblum. The bestiary entry for Lindwyrm says the dragon once destroyed a kingdom, and in the Japanese version the name of the country it is said to have destroyed is the exact name of the dragon - Lindwyrm. In Japanese, the word "Lindwyrm" is virtually identical to "Lindblum".
An NPC in Archades references the Tantalus troupe when talking about the "mummers of Tantalus".
Being the twelfth installment of the series, Final Fantasy XII makes some references to the number itself. Although many of these are not necessarily deliberate allusions to the number 12 (whether they are or not is speculative), they are nonetheless present.
There are twelve licenses for Light and Mystic Armor sets.
There is a man in the bar in Balfonheim who speaks of a man on the Cerobi Steppe who defeated a wyrm and states "But I heard all he does is yell at windmills. Pity the man that rides with him". This is a reference to the title character of Don Quixote, who was known to shout at windmills, believing them to be giants.
The boss monsters Slyt, Phoenix, Fenrir, and Pandaemonium are each referred to the Sì Xiàng in their bestiary entries. They are found at the Pharos at Ridorana both as bosses and a Mark hunted within the Subterra. The Four Symbols(四象,Sì Xiàng?) are a recurring theme in the Final Fantasy series that refer to the four mythological creatures in the Chinese constellation.