If you look at the notary manuals from many of the states, or you look at the advice on some of the advice on notary training websites like the National Notary Association, you see advice like this:
I wonder if this advice is taking advice that is sound in some areas, like preparing wills or conveyancing land, and trying to turn it into a universal prohibition that isn't really true. I'm inclined to think that if the document being notarized is of a type that only a lawyer may prepare (or it could be prepared by an individual acting for himself), then it would be unauthorized practice of law for a notary who isn't an attorney to suggest which kind of notarial act should be performed on the document.
On the other hand, if the document is of a type that anyone may give another person advice about, such as a school permission slip, an application form to obtain a birth certificate, or an absentee ballot application, does the mere fact that a notarization is needed magically transform it into a legal document, so the notary is prevented from suggesting which notarial act should be used?