What are the most common errors or omissions made by notaries public in notarizing documents?

The most common errors by notaries public in notarizing documents are: (1) Failing to attach the notary seal; (2) neglecting to attach the notary public’s date of expiration of appointment; (3) failing to sign the notarized document; (4) omitting names and dates from the acknowledgments, oaths and affirmations, etc.; and (5) failing to properly administer the oath.