- Misspellings: Words that are misspelled in one copy of the document but are spelled correctly in others.
- Omissions: Words or phrases that are missing from one copy of the document but are present in others.
- Additions: Words or phrases that are present in one copy of the document but are missing from others.
- Transpositions: Words or phrases that are in a different order in one copy of the document compared to others.