USCIS recommends that employers review the Employee Information and Attestation area in Section 1 for two common mistakes employees make:
Employers must always provide the Form I-9 instructions to employees. When an employee selects the noncitizen national of the United States attestation box, ensure that the employee has reviewed the definition, item #2 in the Attestation section on page 3 of the instructions.
Other common I-9 errors are noted here:
https://blog.frankcrum.com/keep-out-of-hot-water-with-ice-hr-outsourcing
Review other recent I-9 updates here:
https://www.frankcrum.com/corona-virus-update/