I'm noticing some issues where a field or option will be named one thing in one part of the system (smart list filters, workflow filters/triggers, etc.), but it's called something slightly different in another area of the system. This can cause a lot of confusion and make it difficult to find what you're looking for, or know if you're using the right field.
e.g. "Business Name" field on the Contact is typically called "Business Name" on the Contact record, smart list filters or columns, etc. but when importing a CSV and mapping fields, that field happens to be called "Company Name"?
Or for instance w/ Opportunities: Logically an Opp Status can be OPEN (in any Stage you've defined) or CLOSED (closed as either WON, LOST, or ABANDONED.) But in the Dashboard it shows Opportunity numbers under 3 different labels: 1) Closed 2) Open 3) Lost. So what does that mean... does "Closed" actually only mean "WON"? If so, why not just label it "Won" instead? And where does "ABANDONED" lived in these stats... if not in "Closed", in "Lost"? So that means that in the Dashboard "Lost" doesn't mean "Lost"... it means "Lost OR Abandoned"?
These are a few examples. I'll post more as I run across them.