There are even some references to games that aren't Final Fantasy. For example, in Alexandria in FFIX you will come across a man named Ashley who runs the mini-theatre, who looks suspiciously similar to Ashley Riot from Vagrant Story (which just happens to be a Square game). Other similarities are in name only: the Mist and Ozma of FFIX appear in Legend Of Legaia, Mythril appears in Lord Of The Rings, and other such vague connections.