At the military base, why is a door labeled “Secured Area” left unlocked? Especially considering the secured area contains a building full of weapons - next to a broken fence!

Xander tells Cordelia to meet him at Willow’s house in thirty minutes, wearing “something trashier”. Then Buffy has a dream and goes to school the next day. It’s then night again and Xander, Willow, Cordelia and Oz are at the army base. Joss himself has spoken on this: “I was …

Cordelia is doing her research on the Judge in the fiction section in the library.

In the scene in which Willow tells Giles and Buffy that Oz is the werewolf, watch Giles. When he is standing facing the right, he is wearing no glasses, but when he turns around and faces the left, he has his glasses on.

When Willow is running away from Oz-wolf, she trips in the woods, muddying her overalls. Yet when she enters the library her overalls are clean.

When Buffy walks into The Bronze the left strap of her backpack is hanging down. When the scene cuts to her back, the strap has returned to her shoulder.

Giles’ car gave the crew trouble in this episode so they got some extras to push the car as if it was actually working. You can see the extras through the car’s rear window when it pulls up in front of the Bronze.

As Buffy talks to Giles in the library she is sitting on the chair with her right hand holding her left one. In the wider shot, Buffy’s left hand is holding the right one.

In Xander’s slo-mo walk down the hallway, he passes a group of girls right at the start who then appear in front of him, walking to his right. In the very next shot they can be seen stood to his left. Look for the girl with the dark curly hair …

In the slow-mo sequence of Xander walking down the corridor in Bewitched, Bothered and Bewildered, the same guy can clearly be seen twice, once behind Xander and then in front of him only seconds later.

Up to this point in the series, the doors to the library have always opened inwards, and there are only handles on the inside. When Xander pulls a bookcase across the doors to barricade himself in, Buffy easily opens the door outwards.

After Xander finds out that Amy’s spell went wrong, he takes Cordelia and runs out of school with her, during the day. They head to Buffy’s place, but when they get there it is night.

When Drusilla pushes Buffy’s door down, her hands go into the house - but Drusilla was never invited in.

Many people think it is a goof that Angelus got into Giles’s apartment to place Jenny’s body there in Passion. It’s true we’ve never seen Angel in Giles’s apartment but that doesn’t mean he’s never been there.

Vampires need no invite into public buildings, so why does Jenny ask Angel how he got into the school?