The poem Spike reads in the bar is the same poem he reads to Cecily, the object of his affection, in Fool for Love (2000). After Cecily rejects him, he wanders around London until he runs into Drusilla, who sires him.
Christian Kane (Lindsey) was unavailable for filming at the same time as the rest of the cast, so he filmed his scenes one and a half months before the rest of the episode was shot.
Charles Gunn uses a pair of retractable stakes, hidden in his sleeves, while fighting the senatorial candidate's cronies. These are exactly like the ones used by Angel in the series' first season.
As of the series finale, David Boreanaz is the only actor to have appeared in every episode, David Boreanaz and Christian Kane are the only actors to appear in both the first and last episodes of the series and David Boreanaz, Charisma Carpenter, Alexis Denisof, Julie Benz and J. August Richards are the only actors to have appeared in every season.
Wesley's last scene was Alexis Denisof's last scene, and the last scene of the whole series (in the alley in the rain) was the last one to be shot.