The main character's original name was Agnes. I liked it better. It sounded like a nice, thoughtful, middle-aged woman's name. But I didn't think I could justify that to Mrs. Gotta-Pick-the-Right-Name-for-Everyone. So I changed it to Nadia, using the global change feature. For some reason, that one instance of the old name was not changed. I was so used to seeing the old name from the first dozen rewrites that the one remaining example of it didn't get caught in subsequent proof-readings.
Actually, this was just a quiz to see who was paying attention. Yeah, that's right. A quiz. Right. Glad you all passed.