for example, on the Countries report , the VISITOR metric is displayed against each country. I have had users believe that was a MONTHLY VISITOR number and they were quite surprised it was DAILY. More importantly, they utilized this data in reports as if it was monthly.
I suggest that wherever you have a LABEL called VISITORS, you clarify that as DAILY VISITORS. Maybe the rule is that all VISITOR labels mean DAILY but don't assume everyone knows your rule. Make it more usable.