Much like earlier scribal errors, there are textual errors inserted into digitization projects which may have gone from documentary originals, into handwritten (translated) copies, which then were copied manually via typewriter, and then copied again into some digital form, and then changed again into other digital forms as digital formats changed.
As a result it is often fruitful to be able to compare the various versions to see the sorts of errors which each level of copying can introduce. One might suppose that textual errors were only common when done by scribes using manual techniques, but it is just as likely for errors to be inserted between digital copies as well.