As Delenn and Sheridan enter the station, a man in the crowd is holding a sign, saying "sic transit gloria mundi". However, as the camera angle changes so that the crowd is seen from the back, there is no evidence of any signs in the crowd. Then the camera switches back again and we see the sign once more.
In the final scene, the Sun is shown going nova 1 million years in the future. In reality, the Sun would need to be 8 times more massive to be capable of going nova. It will instead expand into a red giant star in several billion years and eventually become a white dwarf star in about 5 billion years.