When Garibaldi's transport is landing on the Drazi home world, the terrain below is actually the Kuril Islands off eastern Siberia, and the north coast of the Japanese island of Hokkaido.
This takes place from June 20 to June 23, 2262.
When Delenn jokes to Sheridan that she will give him something to sign, authorizing the bombing of Earth immediately as he is busy signing paperwork, it is a joking reference to the incident where President Ronald Reagan was caught on tape joking that he signed an executive order, authorizing the immediate bombing of the Soviet Union.