If you look behind Oz as he talks to Willow near his locker in The Wish, you can see a student in a white shirt, khaki pants, and black bag emerge around the exact same corner twice.

Throughout the final fight, you can clearly see all the safety/landing mats surrounding the platform Buffy’s standing on.

When Buffy says, “Anyone who’s not having fun here. Follow me”, her top is purple, but when she turns round to run away, the top is green.

When the old man steps into the street, his trousers are tucked into his boots. When he turns toward the approaching car, his trousers are untucked and at a normal length.

When Cordy and Xander are lying on the ground, fighting off all of the angry love-struck females in Buffy’s basement, Cordelia somehow finds time to stop struggling and scratch her nose.

When Wood, Buffy and Spike are in the car, Wood looks in the rear-view mirror at Spike - but wouldn’t have seen him as he doesn’t have a reflection. He’s then surprised at the Hellmouth that Spike’s a vampire.

Xander’s hands and feet where tied to the wheel. Robin cuts the ropes on his hands and he falls to the ground. What about his feet?

Why is the restaurant that Wood takes Buffy to down a dark alley? Especially in a dangerous place like Sunnydale.

When Buffy is telling Willow about Principal Wood asking her out, Willow is folding socks. When Buffy asks Willow to check out Wood for anything suspicious, Willow is folding white socks, but immediately afterwards, when Willow asks Xander whether he wants her to check out his date as well, the …

Spike attacks Giles saying that Anya said he was the First… but Spike wasn’t there when they discovered this to be the case, and they disproved it before they saw Spike again.

Surely Willow/Warren got the gun a little too quickly? How easy is it to buy a gun in Sunnydale?

When Amy talks to Kennedy and reveals she’s behind the spell, her necklace is longer than it was in previous scenes.

The Initiative site was supposedly filled with concrete and salted over in season four (said in Primeval), so how do Buffy and Spike get to the caverns?

Andrew reaches out and puts his hand on Willow/Warren, but in the next shot, we see him just reaching out.

Both Dawn and Buffy say that Buffy would have to die to activate the next Slayer, but we know that the Slayer line has now been passed to Faith, so Buffy’s death wouldn’t create a new Slayer.