Legal-Ease: How significant is the error in this document?

Simple, unintentional errors like writing the wrong date are common in documents. Fortunately, the law provides some ways to ignore or correct unintentional errors in important documents. 

Errors in documents are typically characterized as either substantive or non-substantive. Non-substantive errors in documents make a document inaccurate, but wouldn’t change what the document does when corrected. Substantive errors in documents literally alter what a document does.