Two rather silly references
After defeating the final boss and now wander the streets of Grancel, if you should talk to two people around town, you'll encounter a reference and a short 4th wall breaking session.
The reference requires you to talk to a man in front of the Inn in town, taking a picture of his daughter. Talk to him and he'll tell his kid to smile and say "Fuzzy Pickles!". Get it? This is a reference to the random photographer from the old cult favorite game of EarthBound!
The fourth wall breaking is found in the Liberl News building by talking to Dorothy at the desk. She will mention being legible to the "Fuelitzer" prize. Estelle questions that and asks if she meant the "Pul-" until Joshua stops her abruptly by saying "Shhh! You want to get sued?". It's an easy guess to think she meant the "Pulitzer" prize.