When Buffy and Riley have sex, the pillowcases change from being striped green and white to dark red.

in the episode The I in Team, Walsh goes into room 314, and the door shuts behind her. In the next shot, we see Walsh entering the room and the door shuts again.

Buffy tells Maggie that she was thinking about getting a pager but she had one in season one’s Never Kill a Boy on the First Date.

Buffy holds Walsh’s papers at different heights in different shots when she first goes to the Initiative.

When Spike and Giles talk in the cemetery, Spike puts a cigarette in his mouth. The camera cuts to Giles, then quickly back to Spike - and he’s suddenly holding the cigarette down by his waist and then tosses it aside.

Xander doesn’t even go halfway up the stairs before coming back down and stating matter-of-factly that Giles isn’t upstairs.

Why did the Scoobies take so long to go to Giles about the demon? Xander was woken by it at 10am but the Scoobies go to Giles’s place at night.

When Buffy and Willow have breakfast, Willow picks up her glass of orange juice while the camera is facing her. When the camera faces Buffy, the glass is still on the table. Cut back to Willow, and she’s setting the glass down.

Spike throws his lit cigarette away in Xander’s basement and neither Xander or Anya seem to care.

How does Buffy manage to fall into the Hellmouth more quickly than the demon?

When Spike, Willow and Xander leave the museum, Spike is wearing Xander’s short trousers, but when they get to the school, he’s wearing jeans.

When Spike attempts to stake himself, the stake goes flying off and cannot be seen in the shot of Spike lying on the floor. Xander then steps in front of him, and picks the stake up, though the stake wasn’t there a moment before.

When the gang is researching, Xander’s work shirt is open over a white t-shirt. In one shot the shirt is buttoned up, before going back to being open again.

When Riley briefs the Initiative on the demon, he says it was “three metres tall… based on my visual analysis”. It certainly wasn’t that tall.

When the lights first turn on to show Willow with the dead guy, his eyes are open. In the close-up shots his eyes are closed.