Two really dorky things I noticed: A "Mameco the Pug" is mentioned on a secondary page of a bestiary entry in XII, and it reminded me of Mameko the travelling artist from the "Regain Ability!" job from Tactics.
The job "ultimate atavism" in Tactics involves a Marlboro named Carrot, and one of the marks in XII is a marlboro named Carrot.
Nothing ground-breaking, to be sure, but I thought it was neat.