Legal Question in Credit and Debt Law in California

I am always concerned with purportedly legal documents that have spelling or grammatical errors within them. If you know the person to whom you loaned money or provided services signed the note and it contains the terms of the amount loaned or services provided and the payment schedule, it should be binding. If it has not yet been four years since the last payment, you might wish to take legal action or be forever barred after four years have passed.