If your CBP I-94 has an error on H-1B (wrong dates, status, or name), don’t ignore it; it can affect your legal stay. For simple entry errors, the quickest fix is visiting a CBP Deferred Inspection Site with your passport, visa, I-797, and travel details; they usually correct it on the spot. If the mistake came from USCIS (like wrong validity on approval), you may need to file an I-102 or have your employer/attorney request a correction. I’ve seen people get it fixed the same day at CBP, so start there; it’s faster than filing forms.