Shay

Season 4 generally

Revealing mistake: When Lucy plays her violin in Lex's mansion, it's obvious the actress isn't actually playing - her fingers aren't moving and the box is out of time with the music.

Shay

Once More, With Feeling - S6-E7

Revealing mistake: During the song-and-dance number "They Got The Mustard Out", if you look closely at the dancers, the man in green to camera right of the second row is horribly out of step with the music, and with the rest of the group. The spell makes everyone dance far better than they naturally would (Tara loses the clumsiness she often displays, for example), so it is a mistake to have someone under the spell dancing so badly.

Shay

Hush - S4-E10

Revealing mistake: In the fight scene at the clock tower, the first time Riley is knocked to the ground he kicks one of the strait-jacket demons in the face - his foot misses, but the demon still reacts as if hit.

Shay

Power Outage - S3-E7

Revealing mistake: When Astral Prue kicks Leo/Balthazar in the face during the training drill near the start of the episode, her foot misses his face yet he still reacts as if hit.

Shay

School Hard - S2-E3

Revealing mistake: When Spike is talking to the Anointed One for the first time, one of the henchmen tries to rush him from behind and Spike backhands him without even looking, but Spike's hand movements, the reaction of the henchman and the sound of the punch connecting on the audio track are all out of sync.

Shay

Enemies - S3-E17

Revealing mistake: Watch Xander's right leg as Angelus punches him onto the sidewalk - it bends the wrong way at the knee and flies up to his waist, showing that it's a dummy.

Shay

Enemies - S3-E17

Revealing mistake: After Faith brings Angelus back, when she goes to punch him and he blocks, the stuntman switch is very obvious - he's noticeably taller, has different hair and doesn't even seem to be wearing any vampire make-up.

Shay

Beauty And The Beasts - S3-E4

Revealing mistake: In the teaser of "Beauty And The Beasts", when Jeff is running through the woods, you can see in the top left corner of several shots a lamp being used to light the scene.

Shay

Revealing mistake: When the Creeper is chasing Izzy, Rhonda and Double D in the truck at the end, during the overhead shot of Izzy pulling off the road you can see the tire tracks from previous takes. (01:22:50)

Shay

My Journey - S3-E2

Revealing mistake: When Elliot is splashed by the dolphin, if you watch carefully you can see her hair is already wet.

Shay

Goodbye, Yellow Brick Road - S6-E21

Revealing mistake: Watch Busy Phillips' hand in the bar scene where Audrey sings - she's very obviously not playing that guitar.

Shay

The Importance of Being Phoebe - S5-E11

Revealing mistake: When Kaya throws the knife at Phoebe watch in freeze-frame and you can see that for the shot from behind her there's no knife in her hands. (00:36:10)

Shay

Revealing mistake: When Kevin is sitting outside the prom alone throwing pennies into a cup, there's the sound of them hitting the bottom, but if you look closely you can see nothing goes into the cup. (01:11:30)

Shay

Crush - S5-E14

Revealing mistake: When the porter is dragged back onto the train at the start you can see (more obviously if you watch in slow motion) that there's absolutely nothing grabbing him, not even someone's shadow. (00:04:55)

Shay

Revealing mistake: During the scene where the remote guns are firing from the back of the car you can see one of the 'dead' soldiers sitting up to look at the action around him before lying back down.

Shay

Revelations - S3-E7

Revealing mistake: In 'Revelations' when Buffy and Faith are fighting, the kick Faith aims at Buffy's face right after she says 'We can work this out' very noticeably misses, but Buffy still reacts as though it landed. (00:36:15)

Shay

Ground State - S4-E2

Revealing mistake: In 'Ground State' when Gwen is walking towards the lift in Irwin's building you can see Angel's reflection on the shiny door. Vampires don't have reflections, as is demonstrated at various other times in this show.

Shay

I Only Have Eyes For You - S2-E19

Revealing mistake: After Buffy has entered the wasp-filled school there's a shot of the others standing outside waiting for her. In the establishing long shot if you look closely you can see they used the same shot as earlier in the episode - Buffy is standing there with them. (00:34:10)

Shay

Faith, Hope And Trick - S3-E3

Revealing mistake: During Faith's fight outside the Bronze in 'Faith, Hope And Trick' when she stakes the vampire, if you watch carefully, you can see the rubber stake bending. (00:15:20)

Shay

Chosen - S7-E22

Revealing mistake: In the last episode, 'Chosen', Anya beheads two Ubervamps. The second time she swings the sword it very noticably doesn't go anywhere near the Ubervamp's neck, closer to its stomach.

Shay