

It only happens if you do the optional side quest in 600 AD, where you fight the monsters in the sand pit to restore Fiona’s forest, then go back to 1000 AD and go to the shrine. I’m sorry if you missed it, it has some of my favorite moments in the game.
I once loaned my cart to a friend, and looked at their save when I got it back. They named Crono “Punk”, I think Lucca was “Glass”, and Magus was “Goth”. Sadly I don’t have the save anymore and I can’t remember the others.
Edit: Also wasn’t there a typo or something when Robo is first introduced? Like R-66Y vs R66-Y? I tried to name him correctly once but messed it up because of that.