Except for Buffy, all of the First's incarnations at the end of the episode are the previous seasons' Big Bads, in reverse chronological order: Warren (season 6), Glory (season 5), Adam (season 4), Mayor Wilkins (season 3), Drusilla (season 2), and The Master (season 1). See more...
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Buffy The Vampire Slayer (1997) - 301 continuity errors in entire show
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)
Updates: Series 6
When Buffy finds Dr. Gregory's glasses on the lab floor she places them on the table, from the long shot she places them at the left end of the table near a plastic tub with a white lid, with the glasses open. Then it cuts to a close up where they are in front of a book on the right side of the table and are closed. Then cut back to the long shot and they are in the original place.
When Willow hides under the table in the classroom after fleeing the pack, we see that it is on legs and doesn't touch the floor. Yet when Xander comes in and scans the room, he sees the table but Willow's feet aren't visible, even though they should be judging by the height of the table from the floor.
In the scene where Buffy is walking away from Willow and Xander to leave the Bronze, you see her holding a dark jacket right after she feels Angel's presence behind her. As she is walking down the street you can see she is wearing a dark jacket, either dark brown or black. The following scene, she is still walking but wearing a light baby blue colored jacket.