Morgan Freeman gives a Presidential speech about the comet with graphics of the solar system, complete with an analogy between colliding comets and balls bouncing against one another on a pool table. It's exactly like his later role as host of Through The Wormhole. Later on, he also says he believes in God and that he believes God answers every prayer, even if the answer is sometimes "no"- since it's Morgan Freeman, he should know.
Similarily, ten years after this movie was made, Barack Obama was elected as President of the United States, becoming the nation's first African-American President.
When Leo proposes to Sarah, he holds out his hand and reveals two gold rings.
One-Scene Wonder: James Cromwell as Senator Rittenhouse. He only appears in the scene where Jenny tracks him down for an interview but his performance does a great job of foreshadowing the disastrous news she's about to uncover.
The Woobie: Sarah seems to really get it rough. First, she and her family are not selected in the survival lottery (in spite of her marrying her best friend, Leo to get in). And later, when Leo comes to her rescue on the crowded highway, they force her to leave them behind (and to take her baby brother with her), shortly before they are killed by the giant wave.
Gus Partenza, the only astronaut who is left behind in space to die, after the unsuccessful attempt to destroy the asteroid.