OK thanks Enfo,
I will update the script to add those two elements
I also tried the current script on quite a new install of a test forest (single domain) and the results are below
highestCommittedUSN : 98356
DomainUSNChanged : 98336
ConfigurationUSNChanged : 12824
SchemaUSNChanged : 12825
DomainDNSZonesUSNChanged : 12826
ForestDNSZonesUSNChanged : 12827
Total Combined USNChanged : 149638
Thanks
Ernest Brant