Re: popular culture?
There was also the Klingon music the Doctor's holo son was into (if I remember this correctly). But it's true that references to pop culture are very rare. I don't think we've ever seen a celebrity but maybe the celebrity culture we have today went out of style at some point.
"Now and then we had a hope that if we lived and were good, God would permit us to be pirates." Mark Twain, Life on the Mississippi