Giles' assertion that he doesn't have an instruction manual is not strictly true. Apparently, there is a Slayer Handbook but Giles just decided not to use it with Buffy.
After throwing a minion across the room, the Master says "Here endeth the lesson", which is later spoken by Spike in Fool for Love (2000) and Buffy in Showtime (2003).
First appearance of The Anointed One.
The only time Angel breaks character on screen in the entire series is at 28m26s in this episode as he meets Owen.
The episode was alternately titled "The Anointed".