Continuity mistake: In the last episode of Season 5 we see Spike thrown off the tower by Doc. Spike somehow manages to change from black trousers and boots into blue jeans and white shoes mid-air. He's back in black by the time he hits the ground. (00:35:45)
Visible crew/equipment: When Willow does her spell to save Tara, you can see the black pad Tara falls/ stands on.





Chosen answer: From what we see in the series, certain girls are identifiable as potential Slayers - Kendra clearly fell into this category. The identification method is presumably mystical in nature, but the Watchers' Council are pretty effective at that sort of thing, so they're quite good at tracking down the potentials ahead of time. Not perfect, though - it does appear that Buffy herself may have slipped through the net - certainly she had no inkling of what she was until she'd already taken on the role of Slayer. It is possible, however, that this was actually cultural - an American family would hardly be likely to turn over their daughter to some strange man for 'training', so the Watchers might have chosen to keep an eye on her covertly, whereas some other cultures (like Kendra's Jamaican parents) might be more willing to believe.
Tailkinker ★