Trivia: The Anointed One was killed in this episode because over a season hiatus, Andrew J. Ferchland had grown too much. Had he remained, it would have been obvious he had aged, which would have contradicted the established concept that aging is something vampires don't do. For most, if not all, of his scenes, Ferchland remains on his knees.
Trivia: Joss Whedon is known for giving hints for future events. In Graduation Day Part 2 while Buffy is in a coma dream she speaks to Faith. Faith says "Oh yeah. - Miles to go - Little Ms. Muffet counting down from 7-3-0." 730 means 730 days (2 years). If you recall the poem that states miles to go before I sleep. In 730 days Buffy will die in the finale of season 5.
Trivia: Tabula Rasa is a philosophical term. It's a school of thought founded primarily by John Locke and it holds that human beings are born as "blank slates" - that is, they have no knowledge or experience. This is contrasted with a belief system that all humans have certain ideas at birth; "God exists" is one commonly put forward.
Trivia: In the episode 'The Replacement' when Xander is trying to convince Willow that he is the real Xander, he does the Snoopy dance for her. Nicholas Brendon didn't know what the snoopy dance looked like and just attempted it after a brief description. He is now frequently asked to perform it at any fan conventions he attends.
Trivia: In the scene preceding the credits for the first episode of season 2 'When She Was Bad,' Buffy saves Xander and Willow from a vampire, she then says 'Hi guys, miss me?' This is addressed to Xander and Willow but is said straight into the camera and is also addressed to the fans who had waited a long time between the 1st season and the 2nd.
Trivia: The way Spike enters Sunndydale (driving into the sign) is a reference to the first time we met Spike in the season 2 episode "School Hard." Both times he drives into the sign, however in School Hard he steps out but in Lovers Walk he falls out, drunk. The music is even the same.
Trivia: The Columbine school massacre happened about a week before the episode was originally supposed to air. Since the episode dealt with a potential school shooting, the producers felt it was respectful and necessary to postpone the episode's airdate. Coincidentally, a similar event later happened to David Boreanaz when the Bones episode "Player Under Pressure" was postponed following the Virginia Tech massacre.
Trivia: Willow's conversation with a dead person in this episode is with Cassie, of which it is explained that Willow isn't allowed to see Tara because she killed people. In actual fact, the writers did intend for Tara to appear in this episode, however actress Amber Benson was busy with other filming commitments.
Trivia: While Buffy is the universe's primary focus, Angel holds more appearances in Buffyverse canon, appearing in 168 episodes of Buffy/Angel (as well as the canonical comic book "Angel: After the Fall"), as opposed to Buffy, who only appears in 149 episodes and the canonical comic book "Buffy Season Eight."
Trivia: Xander was originally supposed to be the character that died in Chosen. He was suppose to die saving Dawn. Since Emma Caufield didn't want to be tied to doing any future Buffy projects the script was changed so that Anya would die. The script is the same except the parts at the end written for Anya and Xander were switched as well as the parts for Andrew and Dawn.