It should be noted that this is the final appearance of Seth Green as Oz in the real world. The character does appear in the season finale Restless (2000), but it is in Willow's dream sequence.
When Buffy is in Riley's room, she is wearing the same thing that Faith (in Buffy's body) wore at his place in Who Are You? (2000).
A scene between Jape and Adam was cut from this episode. Nevertheless they remained credited. The scene in question reveals that the demons shown in the episode were unleashed by Adam as a test against the Initiative soldiers. Though deadly, Adam believes they are "not enough" for his plans.
This is Seth Green's first time in Season 4 as a Guest Star. Due to him leaving earlier in Season 4, which is why he's not appearing as a main Cast member in the Intro. He just returned for this and in Restless (2000).
Oz mentions his time in Tibet, which he will tell the Scoobies in more detail in the comic Retreat, Part Two.