In an early episode, the Emperor's consort is met by Londo. She has a vision, backs up against a panel on the wall, where the screen is announcing an upcoming concert by The Rolling Stones.
There is another reference to the 20th century on Bab 5. In one episode, I forget which one, Garabaldi is taling with someone in the bar, and a Zima electric bar light can be clearly seen in the background.
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