I flew KL0681 AMS-YVR a couple weeks ago.
On my NW outbound I UG'd at check-in w/ miles. It was unclear to me if the 30k was O/W or R/T and because it was one of those nifty OTP tickets, I didn't want to rock the boat. So I decided to wait till my return day.
While in Lounge 52, I inquired about the possibility of an UG. I was politely told, "No, sorry", I thanked her for her help and went on my merry way.
Since I had a Row 9 aisle in Y, I hung back at security and waited till the very end to board. My BP beeped and I was given 5A.
So, I'm not sure why I was UG'd. Status? or the Lounge? I do not know.
On board, after being addressed with surname, I told my FA to call me by my first name. She was tongue-tied for a moment, explained that it might be difficult but she would try to remember to do so. We had a nice chat about their (KLM and Dutch) formality. I noticed from that point on though she didn't address me by name, period. It was probably easier for her to do that than veer into uncomfortable territory.