A printed correction list can ask you to replace a word, number, or reference elsewhere in the volume. Before applying it, confirm that you are reading the edition and printing to which the list belongs.
An invented example makes the problem clear. A list says “page 42, line 7: read west for east.” In one printing, that line contains the word east. In a revised printing, the correction may already be incorporated or the page layout may have changed.
Write down the printed reading, the instructed replacement, and the location of the errata notice. Do not silently erase the first reading from a transcription intended to document the page as printed.
When quoting the corrected passage, explain the intervention briefly if it affects your argument. A reader should be able to distinguish the page’s visible wording from the edition’s proposed correction.
Some correction notices concern a reference rather than the sentence itself. Follow the corrected reference to check that it reaches the intended passage.
The exercise is especially useful when older scholarship circulates in scans. A search result may expose the uncorrected page while leaving the separate notice out of view. Check the preliminary and final matter before building an interpretation around an apparent contradiction.
Editorial illustration from this site’s image library; not documentary evidence of the example or object discussed.