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The Prom - S3-E20

Continuity mistake: When Buffy is fighting the three Hellhounds outside the school, she kills one of them and the other two enter the school, having heard some music playing from inside. But when Buffy follows them inside, the music has stopped.

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Graduation Day (2) - S3-E22

Other mistake: At the end the library that was rigged with explosives blows up. But the school's main entrance and the clock tower blow up as well, even though they are not rigged with explosives.

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The Prom - S3-E20

Other mistake: When we first see one of the Hellhounds at the clothes store that Cordelia works at, it jumps through the window, smashing the glass, and then attacks a customer who's wearing a tuxedo. But the Hellhound attacks the customer several seconds after it smashes through the window, giving the customer a chance to escape. But the customer just stands there unaware of the Hellhound, having not heard the window being smashed.

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Continuity mistake: Seeing as how the original sets for the ship's interior from "Firefly" were demolished after the show got cancelled, the interior had to be re-built from scratch for Serenity. Because of this, there are some noticeable differences between the two. For example: The long corridor that holds the entrances to the crew's sleeping quarters is a lot wider. The hand rail on the stairs leading from the infirmary to the cargo bay is missing. The back wall of the cargo bay, the entire engine room (including Kaylee's hammock), some of the table settings in the kitchen and the furniture in the lounge area are all different to how they were in "Firefly".

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Revealing mistake: On Miranda there is a shuttle crashed into the side of a building, but there are no burn marks or a trail from where it had crash landed. The shuttle couldn't possibly have crashed into the building horizontally without crashing diagonally/vertically first, landing horizontally and then sliding into the building. Joss Whedon even states in the director's commentary that some burn marks would have been nice but it only occurred to him about 14 months after it was filmed. (01:17:15)

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Continuity mistake: During River's first fight scene she climbs some stairs. She then does two forward flips down the stairs. As she lands, her hair is raised from doing the flips but in the immediate shot her hair is down again. (00:34:55)

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Earshot - S3-E18

Revealing mistake: When Buffy beats up the school cook for trying to kill all the students with rat poison, the cook's stunt double is a lot thinner than the actual cook.

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The Big Bang - S5-E13

Revealing mistake: When the Doctor travels back in time after being shot by the stone Dalek, falls down the stairs and tells himself that he has 12 minutes to live we never see either of the 2 Doctors' faces onscreen at the same time, and if you look at the hair on the Doctor that's dying it is completely different to Matt Smith's. That's because it is Gordon Seed, Matt Smith's stunt double.

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Bad Girls - S3-E14

Revealing mistake: Near the end of the episode when the Mayor releases the vampire from his cage and lets him cut his head in half, you can tell that the Mayor's head is a still image when it fixes itself. The expression on his face doesn't change at all and looks completely unrealistic.

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Doppelgangland - S3-E16

Revealing mistake: When evil Willow licks good Willow's neck the neck that you see is a lot longer than either of theirs. Since both Willows' faces cannot be filmed at the same time a body double must have been used for this shot.

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Amends - S3-E10

Visible crew/equipment: When Willow and Oz realise that it's snowing, the camera pans outwards away from the window. The camera is reflected in it.

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Doppelgangland - S3-E16

Revealing mistake: Right at the beginning of the episode, Buffy is sat outside with Willow and Willow is levitating a pencil. The pencil is obviously CGI as it stands out from the rest of the picture and doesn't cast a shadow. It also disappears from view whenever there is a side-angle shot of Willow.

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Doppelgangland - S3-E16

Revealing mistake: Near the end when the good Willow says goodbye to the evil Willow and hugs her, there is a shot of the back of the good Willow's head and the evil Willow's face. You can tell that the good Willow is a body double wearing a wig - there's something circular near her scalp, possibly an elastic band.

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Doppelgangland - S3-E16

Revealing mistake: Both the good and evil Willows' faces are barely seen onscreen at the same time due to them being played by the same actress, but when they occasionally are the good Willow stands out from the picture more than the evil Willow. She must have been filmed separately from the good Willow and edited in later.

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Bad Girls - S3-E14

Plot hole: Buffy saves Angel from Balthazar by dropping a light into the tub of water that he's sitting in. But why would the tub have been put directly underneath a light? Balthazar was being kept alive throughout the episode, wouldn't having a light above him be a bit unwise?

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Serenity (1) - S1-E11

Visible crew/equipment: As Serenity touches down on the Eavesdown Docks on Persephone, a crew member can be seen pushing Wash's mule down the ramp just after Mal talks to Kaylee about passengers and the ship's Compression Coil.

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The Big Bang - S5-E13

Continuity mistake: When Amy's dad stands up to present his speech at her wedding, a tear runs down the right side of Amy's face. In the next shot of her the right side of her face is completely dry.

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Helpless - S3-E12

Plot hole: When Buffy enters the house to rescue her mother she uses a stake to stop the front door from closing. A vampire then grabs it and the door closes. Why did Buffy use a stake knowing that there was a vampire there when she was almost killed by a vampire with her own stake earlier in the episode because Giles had been injecting her with a muscle relaxant?

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Bad Girls - S3-E14

Continuity mistake: When Buffy and Faith are fighting the vampires after going down the manhole, one of the vampires tries to drown Buffy. After she pretends to be dead and attacks him with a sword, her face and hair are almost bone dry.

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Helpless - S3-E12

Continuity mistake: After Xander and Oz's "Kryptonite" conversation, Buffy tosses a book onto the table and stands up to leave. The book lands partially on top of another book and slides almost off it. In the next shot the book is lying on top of the other book perfectly.

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