Man...I added a soldier in the Inn who is on a trip with the Choras pilgrims to the new Cathedral, and replaced the Reptite Ending dialogue of Crono's mom. No harm done, and a perfect success. Load NPC, Facing, Animation, Textbox, whatnot, etc.
Now one of the Zeal instruments is messed up, and the real Crono's mom dialogue at the beginning of the game only displays the last line of the string that follows it (Wake up! / Today is a big day!).