Buffy The Vampire Slayer (1997) - 42 mistakes in series 7
Directed by Joss Whedon, starring Alyson Hannigan, Amber Benson, Anthony Head, Charisma Carpenter, David Boreanaz, Emma Caulfield, James Marsters, Marc Blucas, Michelle Trachtenberg, Nicholas Brendon, Sarah Michelle Gellar, Seth Green
Lessons
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.
Beneath You
Same Time, Same Place
Continuity: In episode 'Same Place, Same Time', Gnarl cuts Dawn across the stomach paralysing her and ripping her shirt, but when Buffy and Xander are carying her home there is no tear in her shirt or any blood. Also when Buffy goes back to kill Gnarl he tears her shirt but seconds later the rip has gone.
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.
Help
Visible crew/equipment: When a guy asks Dawn out to Winter Formal and she says "What?" - you can see a microphone at the top of the screen. Submitted by Grigory the Wanderer
Continuity: Towards the end, when Buffy stops the arrow, when she first grabs it her hand drops down to Cassie's mouth level, and her arm's bent at the elbow. When we cut to another angle it's now held at arm's length and at about eye level. Submitted by Jon Sandys
Selfless
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.
Him
Conversations With Dead People
Sleeper
Continuity: When Anya is sneaking into Spikes room after she closes the door the shot goes to spike and the sheet is lying square across his stomach and the camera goes back to Anya she then walks over to the chest of drawers and we see spike in the shot and the sheet is now lying at an angle so we can see his hip.
Never Leave Me
Continuity: Buffy tells Spike that he attacked Andrew when the First was controlling him. Spike asks who that is, and when Buffy tells him it's Tucker's brother, Spike recognises the name. There's no way Spike could know Tucker, who the Scoobies only met briefly and during a time when Spike wasn't around. If he was going to know either brother, it would be Andrew, who he interacted with several times in the previous year.