APA has made a 40-minute video on "how to review a manuscript." You can register andreceive a link to view it at http://www.apa.org/pubs/authors/review-manuscript-ce-video.aspxPlease please feel free to point new or junior reviewers at this resource.
In particular, if you plan to collaboratively review a manuscript with an advanced predoctoral student or junior colleague (see http://www.apa.org/pubs/journals/features/collaborativereviewmodel.policy.pdf), it would be a good idea to have them view the video as part of your mentoring process.
--Eliot Smith (Editor, JPSP: A&SC)