Buffy is clearly holding a dummy of Dawn when she runs from Glory at the beginning of the episode Spiral.

When Glory crushes Tara’s hand, blood drips onto the bench, but later shots show a clean bench.

When Glory’s minions spy at an open window at Buffy’s house, we see Dawn talking to Buffy about how school is useless since she’s a Key. Why didn’t they hear this?

Buffy’s stunt double can be seen during the big fight at Glory’s place.

When Spike insults Glory, his lips are out of synch with the sound of his voice during the shot of Glory turning to check herself out.

Spike’s face is in direct sunlight when Glory pulls him up by his lip. She then throws Spike on the bed, and his left arm is also in direct sunlight - he doesn’t burn on both these occasions.

Glory punches Spike while his hands are tied behind his back. You can see his hands are untied when he is knocked back, but in the next shot when he hits the wall, his hands are tied again.

Glory’s minions kidnap Spike at night but it’s daytime by the time they arrive at Glory’s place with the vampire.

Spike’s stunt double is clearly seen when he first fights Glory’s minions.

When Spike and the Buffybot are first alone in his crypt, Spike puts the robot in a neck hold. The Buffybot’s hair moves from over to under his arm in different shots.

The day after Joyce’s funeral, Willow, Tara and Dawn are in the girls’ dorm room. In the long shot of the scene, there seems to be a man sat in the left-hand corner of the room. The perspective is all wrong, as he looks the size of a ventriloquist’s dummy, …

When Buffy tells Angel about whether she could have saved her mother if she’d been there at the time, she says, “They said ‘probably’ wouldn’t have made a difference. The exact thing they said was ‘probably’.” The doctor’s exact words were actually, “It’s doubtful that this could have been dealt …

When the camera pans past Buffy’s bedroom before the funeral, you can see that there’s no ceiling in her room.

Buffy tells Dawn the news in the hallway during class. Kirsty and her friends are out in the hallway watching Dawn and Buffy. Why aren’t they in class?

Dawn’s drawing changes completely between when Buffy arrives in the classroom and at the end of the scene where Dawn discovers the news about Joyce’s death.