Phoenix

Chosen - S7-E22

Revealing mistake: Early in the final fight, Vi makes a flying kick to knock an Ubervamp off the cliff. As she lands, she swings back and twists slightly, suspiciously like one would do if suspended on a wire. There is no way she could gain this motion by kicking straight off the vamp as shown. (00:29:00)

Phoenix

Witch - S1-E3

Revealing mistake: The edges of Cordelia's solid white contacts can be seen after she is blinded. (00:20:00)

Phoenix

Gone - S6-E11

Revealing mistake: The entire time invisible Buffy is on Spike's bed, she makes absolutely no impression on the mattress and sheet underneath her. (00:29:55)

Phoenix

Once More, With Feeling - S6-E7

Revealing mistake: The knives Giles throws during Buffy's training are a very poor CGI job if you watch it in slow mo. All three knives Giles takes off the wall are identical, with a broad curved blade and a plain black handle. The first one has a transparent blade as it flies toward Buffy, then we hear it bounce off the far wall and it's way out of scale for the distance. The second knife has a diamond-patterned grip instead of a plain one. The third knife conveniently spins in midair for a second so Buffy can kick it out of the way. (00:30:35)

Phoenix

Life Serial - S6-E5

Revealing mistake: The entire scene where Buffy is experiencing accelerated time, shadows of trees move in the wind but never actually grow or shrink. Even over short increments of time, the sun can move shadows noticeably, and judging from the speed of the people around her, Buffy is in accelerated time for at least half an hour. (00:08:25)

Phoenix

Flooded - S6-E4

Revealing mistake: Near the end, the TV behind Andrew shows the periscope's view, but it doesn't match the movements he makes with it. (00:36:25)

Phoenix