Eric and Chris never appear again in the series, but they do feature in the official Sunnydale High Yearbook 1999, where both seem to have benefited from therapy.
Angel reveals that he is 241 years old.
The destruction of the "old science building," the only structure of the original school still standing after the earthquake of 1937.
Daryl is the second known instance of a person being revived from the dead in the Buffyverse, the first being Buffy in Prophecy Girl (1997), and the first successful attempt with someone who could not be resuscitated by conventional means. However, it is a scientific/medical-rather than magical-reanimation of Daryl's body, begging the question of whether his soul would be returned to his body; this could explain his considerable lack of morals (blatant manipulation of his brother; willingness to commit murder).