That wouldn't be the first time something like this happened. It comes to mind that the album titled "John Wesley Harding" is named after the outlaw John Wesley Hardin (no g). I'm genuinely not sure if these changes are a result of sloppiness or creativity.
"Her hands tightened on the steering wheel. For the first time in all our talks on the subject, I sensed from her something more than reticence. The ambiguity of whether I was Dylan’s child was so much less important than the certainty that I was hers. I hadn’t seen that, and she was hurt. We drove the rest of the way in silence."