How about comments that indirectly imply us*!
( not counting me lol)
All the civs leaders are members of a galactic blog*, and they read things people say there, and they say funny things about it in the game. Example.
" I wonder what I am 'going to name that star', once I conquer it?"
"get ready for some 'real time combat' because we're declaring war"
Lord kona: "just because we are friends doesn't mean you can date my daughter."
and since the devs are around each other every day they can put funny things we don't know they say as Easter eggs.