[After finding Spike outside her house.]
Buffy: What are you doing here, Spike? Five words or less!
Spike: [counting on fingers] Out...for...a...walk... Bitch.
Spike was only supposed to appear in a few episodes, and then killed off. But he became so popular with fans, he remained on the show, and eventually appeared on "Angel" as well. See more...
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Buffy The Vampire Slayer (1997) - 86 mistakes in season 7
Directed by Joss Whedon, starring Alyson Hannigan, Amber Benson, Anthony Head, Charisma Carpenter, David Boreanaz, Eliza Dushku, Emma Caulfield, James Marsters, Juliet Landau, Kristine Sutherland, Marc Blucas, Mercedes McNab, Michelle Trachtenberg, Nicholas Brendon, Sarah Michelle Gellar, Seth Green (add more)
Visible crew/equipment: When Xander is in the bathroom after Buffy called him to look for the talisman, he bends down and grabs the talisman that lays under the sinks. As he stands the camera pans up to the mirrors and on the left side you can see the reflection of a crew member crouching over the hole to the old school. It's not the female manifest spirit as the clothes are wrong and she then appears from a different part of the room.
Continuity: Shortly after the opening credits we see Buffy, Dawn and Xander driving to the new high school. As they're talking, the rest of the credits roll by onscreen. Just after "Producer: Marc David Alpert" is shown, there is a side-angle shot of the car and you can see Xander's left arm resting outside on the open door window. But in the following shot he has both his hands on the steering wheel.
Other: We're shown a variety of photographs and pictures of different members of the gang at one point. One of those, the one of Xander and Anya, is actually a shot from the episode "Something Blue". I doubt very much that during the events in that episode, someone conveniently decided to take a photograph.
Revealing: When Anya sings her song about how she will become Mrs. Harris, she spins Xander's chair around after putting a blanket on him. When she is also sitting on the chair, and you see an overhead shot of them both, you can see a section of the stage floor rotating beneath them keeping the chair spinning.