The issue is whether the wrong date is in the Notice of Right to Cancel or in the payment schedule, which is a material disclosure under Footnote 40 to Regulation Z. An error in the Notice or in a material disclosure triggers the three year rule. Other TILA errors do not extend the right to cancel, but may result in a potential penalty uner 15 USC 1640 (15 USC 1641 for the investor). If the error was only on the acknowledgment of receipt, that is not a required part of the disclosure, and you only face an issue with your regulator (you are required to be able to prove compliance with TILA)