The easiest way to correct an error was to erase it. This was done by scraping off the mistake with a penknife and re-penning back in the correct letter, word, or phrase. Mistakes corrected in this manner are sometimes easy to see because the new text is not uniform with the rest. If the correction is longer than the erased space, the scribe had to write it in smaller than the surrounding text.

Another way to correct mistakes was to strike out or place dots under the incorrect words. This was to tell the reader to ignore this part of the text. Errors corrected in these manners were usually from eyeskips. Eyeskips occurred when a scribe skipped or repeated letters, words, or phrases, due to close repeated occurrences of those letters, words, or phrases in the text they were copying from.

In the image on the left, you can see a smudge in the middle of the page that was most likely caused by erasing a word with a penknife.  

On the leaf to the right, a correction has been made about a third of the way down by crossing out two worlds with red ink.

Another type of error was transposition. If a scribe accidentally invented word order, it could be corrected using superscripted A’s and B’s. They would place an A above the word that was to be read first and a B above the second word.