If you have SP03 installed, the new Notes Checker feature makes it easy to verify whether the required notes are implemented. If there are any new notes identified as required regarding security and relevant for Personas, this tool will recognize that and tell you if anything is missing.
However this relies on the Personas team getting notified about such notes so that we can make sure the Notes Checker knows about them. We try our best to keep up with this of course but in some cases it is possible that a note only applies to certain situations therefore it cannot be made required for all customers. In such cases, the local basis team has to determine whether the note should be implemented.