Yes, notes are assigned to a field. We use the date field at the top of page 1 on all returns for our general notes, since it's convenient and a field we almost never use.
Review type notes should be in the field or form they are related to.
Some users add the Permanent File form and type notes on one of the blank pages, or a blank statement page of the Elections form, but notes show up when you review a return and to me are the preferable way to go.