In the final scene of Lessons, we see the First take the form of previous Big Bads. Drusilla/the First briefly moves Spike’s hair, but we discover later that the First can’t touch anything.

Joss Whedon points out in his DVD commentary for Lessons that Buffy’s clothes don’t have any pockets, yet she manages to put her phone into an “invisible” pocket at the back of her trousers a couple of times. At one point she tucks it into the back of her trousers …

During Buffy’s fight scenes she seems to be wearing trainers - but before and afterwards she’s wearing high heels.

Amber on the episode Seeing Red:
“There’d been hints that we were going to have some sort of love scene, but I didn’t really understand what the extent of that was going to be until I went in for a wardrobe fitting and Cynthia, the wardrobe supervisor, said, ‘Now, what kind …

Amber Benson had the following to say about discovering Tara would die:
“I knew at the beginning of Season Five that Willow was going to go bad and that I was going to be the impetus for that, but I wasn’t 100 percent certain about the dying until the very end …

Xander mentions his Babylon 5 commemorative plates. They don’t exist - they were planned, but never released.

Anya says that she has never been hurt really bad before since she became human, but she was stabbed badly through the hand in the episode Where the Wild Things Are.

It’s strange how the answering machine only plays back the middle part of Xander’s message - and the exact part that he needed to hear!

When Xander leaves Willow’s room to go to Anya’s he doesn’t have his multi coloured shirt on, as he left it at Willow’s place. When we see him arrive at Anya’s, he has the shirt on again.

In the scene with Spike and the mannequin, Spike has a tan line on his arms, where his t-shirt has been. Vampires don’t tan - they dust.

When Mort lifts Buffy up by her neck, we see that she is wearing white high heeled boots, but in the next shot she’s wearing light brown boots.

In the scene where we first see Harmony and her minions, at one point Harmony is talking and the camera focuses on a minion placing a unicorn on a table. We can see Harmony in the background and she clearly isn’t talking.

Willow’s hair changes between when she goes into the magic shop and when she stands behind the counter.

When Giles pulls his car in to see Willow and Tara, he gets out of the car and just throws the keys back into the front seat before walking off. Great security!

When Buffy has a heart to heart with Giles at the end of Buffy vs Dracula, she is wearing a gold chain around her waist. It disappears when she stand ups and we see her from behind, then appears again.