Distractions

I've both heard and read how, if an author keeps using a word over and over or a grammatical device again and again, this will be a big distraction for a reader. It seems this true for a writer too.
I'm presently working on Dora's Story, Part 5. I'm close to the end of the part and thought I would finish it last night. That was before the distraction hit.
There are two ways to spell Susanna - with and without a final h. To this point in the Part I had used the version without the h. Suddenly the h appeared.
Within a few paragraphs I was no longer really going over the words just scanning for every use of Susanna to erase that final h. Yes, I could use find and replace. Every time I use that the program refuses to give up once it is done and closed.
I think I found and erased all those unwanted h's. Tonight maybe I can correct the time problem. Somehow the girls can't visit for a week and a weekend both. It's amazing how many little glitches appear in a rough draft.