Christopher McCandless: Rather than love, than money, than faith, than fame, than fairness... Give me truth.
When Chris is sleeping in his yellow car during the thunderstorm, he gets hit by a flash flood. Afterwards he abandons his car and removes his licence plates. His plates are: UW4-924. A few minutes later his parents decide to visit Chris in Atlanta. We then see a shot of a white car on the freeway, which has the exact same licence plate (UW4-924).
While certain details of the story were altered for the confines of film, the characters Jan Burres played by Catherine Keener and Ronald Franz played by Hal Holbrook were both, according to research, entirely accurate. In fact when Jon Krakauer, the author of the book with the same name, contacted both people, they remembered Chris well and expressed great loss when learning of his death.