Chap 2, page 85:

site policy - no screen saver
HR OU - block inheritance
HR > HR Users OU - hide display settings / restore screensaver

1st issue: hide display settings becomes hide mouse pointers on bottom of pg 85
2nd issue: AD group created to filter restore screensaver gpo, no users added to group, Authenticated Users removed from SOM, gpo linked to HR Users OU. Users shouldnt get the screensaver back since they're not in the filtered group, but they do (pointer settings work as they should). This is because Block Inheritance is set at the parent OU and flows down to sub-OUs. The example tries to prove that the restore screensaver GPO will pass over the users since theyre not in the filtered AD group, but it's meaningless since Block Inheritance is enabled which prevents the site's GPO from taking effect, in turn allowing to all (OU users) what is supposed to be allowed to some (filtered group).