When Sherman and Cooper are rolling up on what they believe is a DB call, you can see Sherman applying something under his nose, asking Cooper "Do you want some?" Some officers will apply a little dab of Vick's under their nose as a way to mask the smell of a body decaying. This is only partially effective and only for a short period of time.
Shawn Hatosy (Detective Sammy Bryant) grew a beard and mustache as the character on Southland for "Cop or Not", but appeared on Dexter as Boyd Fowler with the same beard and mustache. Therefore, Shawn Hatosy had the beard and mustache for Dexter in October 2010 and worked it into Southland in February 2011.