Here’s an example of my editing style. I’ve taken one piece of flash fiction and screencapped the unedited version, and then the version with my edits, including words and letters added and changed, and one comment.

Click for larger versions.

The unedited version:
Picture 3

The edited version:
Picture 4

Notice how in the first paragraph, the same letter (“n”) is missing from several words, but a spell checker would never have caught it, because without that one letter they are simply different words.

(Thanks to my friend Charley for providing the example!)