Things you look at differently 20 years later???

Along the lines of this thread where ppl don't know who John Glenn, the U.S. Astronaut is and why he was on Frasier as the voice of Roz's Space Odessy episode TIL John Glenn is a REAL person : r/Frasier

What other nuances do you see in Frasier that might be totally overlooked if you weren't of that generation???