Continuity mistake: When Buffy is talking to Riley, she puts the scarf on her head, on his hand. He talks to her and says "Maybe I am the bad guy," and in the next frame her scarf is back on her head again, then off again in the next frame. (00:24:20)
Beware the Third Wish - S1-E31
Continuity mistake: The Wicked Wisher throws giant exploding coins onto the field TJ is on, as TJ runs towards the WW. The giant coins remain on the field after they explode, yet when TJ reaches the top of the field, there is no sign of the coins, or their remains.
Continuity mistake: As the current host for His Shadow is dying, the Clerics are rushing him towards the temple structure for the Divine Predecessors and towards the foremost column to perform the transference operation. In the shot showing all the columns as they rush towards it, the bottom of the closest one is normal like the rest. When the camera cuts to a side angle as the Clerics reach the base, there are suddenly doors and curtains there with three other Clerics standing at the ready. (00:14:20)
Continuity mistake: The fish that Harley uses to protect herself from the Joker changes shape and size every shot.