Corrected entry: In the scene where the Mayor and Mr. Trick are reviewing security footage of Buffy and Faith entering Allan's office, Mr. Trick can be seen in the footage. As Mr. Trick is a vampire, this should not be possible, as a vampire's image can't be captured.
Correction: Vampires have no reflection, however, they can show up on film. ("They can be photographed, just not very well" according to Wesley Windham-Price.)
Corrected entry: After Buffy rises from her grave, her face is surprisingly clean for someone who just climbed through six feet of dirt.
Correction: Not so much a mistake as consistency - new vampires are oddly pristine as well.
Get It Done - S7-E15
Corrected entry: In 'Get It Done' the First repeats Buffy's words to the Potentials to discourage them, but the words it speaks are different to Buffy's - they change from 'there's nothing I can do to stop that' to 'and nothing I can do will stop that'. Granted, the meaning is the same, but shouldn't the omnipresent evil know what it's repeating?
Correction: The First is reminding the potentials - the words don't need to be exactly the same, and the First knows that. In fact the slight change of wording is going to look less suspicious anyway.
Once More, With Feeling - S6-E7
Corrected entry: During Buffy's training montage, she is seen punching a bag with her wrists bent. First, that's going to be a weak punch, super strength or no, because she can't transfer the force from her arm and body; it just bends at the joint. Second, that's a great way to injure your wrist, because all that escaping force snaps the bend farther. You could strain or even break the joint. After six years, Buffy should know better. (00:31:50)
Corrected entry: When Buffy and Spike argue about the wedding and she says "You think I don't live with the shadow of Drusilla over my head. Like you won't be thinking of her when you're making sweet love to me," you can see a crew member wearing a light sweater at the right edge of the screen. (00:26:30)
Correction: It's Spike's head and not a crew member.
Some Assembly Required - S2-E2
Corrected entry: The vampires are digging the master up and one digs w/ his hands and they begin to smoke and he says "the ground, it's consecrated, it burns." But you never see any vampires in the cemetery burning when they dig themselves out of their graves.
Correction: The Master's grave was consecrated with special rituals that Giles, Willow, and Xander performed which are more powerful than the consecration done with ordinary funeral rites. Vampires that emerge from the grave also do it quickly and explosively enough that the consecrated dirt likely never comes in contact with them.
Corrected entry: In "Halloween," when Willow is walking by Oz's car, when they show Oz, the steering wheel is on the left side of the car. They aren't in England.
Correction: You dont have to be in England to have a car with the steering wheel on the other side of the car. I've seen several left sided cars in the States.
Corrected entry: When The Initiative are looking through the thermal goggles, it shows the first three or four people before Spike to be 68.6 degrees. But not everyone's temperature is 68.6 - it's just an average. Running or even talking could make it a different temp.
Correction: As you say, that's the average reading, and there's not a lot of variance from that. It stands to reason that a sampling of only 3 or 4 people could all show the same temperature.
Once More, With Feeling - S6-E7
Corrected entry: When Tara starts with her song ("I'm Under Your Spell"), her hair is normal. When they are in their bedroom her hair has a zig zag in it. (00:09:05 - 00:11:00)
Correction: Reality is being changed by Sweet's magic. (Monsters are joining in as backup singers, lighting and wind effects appear; and in the later flashback to this episode, costume changes occur.) It's entirely possible that this could include makeup and hair changes.
Corrected entry: Principal Wood told Buffy that it was Friday, the next day Cassie died, but she died on a Friday.
Correction: This is incorrect. Cass died on the Friday night. She was kidnapped after school on Friday, and that same night is when they tried to sacrifice her and then her heart finally gave out.
Corrected entry: It's been nearly 3 years since anyone was last in The Initiative, given that it was blocked off at the end of season 4. Shouldn't the corpses be a lot more decomposed?
Correction: The complex is airtight. This would significantly slow the process of decomposition.
Dead Things - S6-E13
Corrected entry: Toward the end of Tara and Willow's conversation outside the Magic Box, Tara's hand disappears from her shoulder strap for one shot. It's there before and after. (00:23:05)
Dead Things - S6-E13
Corrected entry: Buffy is going to confess to the police and Spike is trying to stop her, so Buffy is punching him repeatedly in the face. We cut to Spike who is bleeding from his nose, which is all well and good. But then we cut to Buffy and she says, "I will never be your girl," and then it cuts back to Spike, he now has a huge cut over his left cheek that wasn't there before. (00:36:00)
Corrected entry: In the first season, Giles tells everyone that for a vampire to make another vampire, the victim must drink the vamp blood too. Throughout the whole show we see vamps constantly killing people by draining them and dumping them, only for the victim to come back later as a vamp themselves, without feeding from their killer at all.
Correction: The show's mythology is consistent on the point that for a human to be turned into a vampire they must drink blood from the vampire, as well as being fed on. This is not contradicted in any season of Buffy or Angel. We may not always see this part of the process, but that doesn't mean it has not taken place.
Dead Things - S6-E13
Corrected entry: At the Magic Box, Dawn's arms shift between the wide shot at the table and her line, "Does this mean you're not going away?" (00:38:10)
Corrected entry: Spike bursts into the Trio's lair by breaking through a side door that leads to the outside. But they didn't invite him in, so he shouldn't have been able to enter like that.
Correction: Spike was invited into Warren's house by his mother off-screen at the end of "I Was Made To Love You." The Trio doesn't have access to the spell to undo the invitation, so it's still accessible to him.
Corrected entry: There are three actors who have the rare accolade of having appeared in the three Mutant Enemy shows: Buffy, Angel and Firefly. They are Jonathan M. Woodward who played the vampire Holden Webster in the Buffy episode 'Conversations With Dead People', Carlos Jacott who played Ken in 'Anne' and Andy Umberger who plays recurring vengeance patron D'Hoffryn.
Correction: This is hardly a "rare accolade". Show creators and directors will regularly use the same actors in different productions, people who they know well and can rely on. It's a common-place phenomenon in the media. It would, frankly, be more of a surprise if there were no actors who appeared in all three shows.
Corrected entry: 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.
Correction: In the years that have gone by since the Scoobies' encounter with Tucker, the incident could have been brought up in numerous conversations whilst Spike was present; therefore it's not impossible for him to recognise the name. As for him not recognising Andrew, this merely sums up how insignificant Andrew is to those who meet him.
Corrected entry: Early on in season 5 Buffy is surprised by Dracula referring to her slaying/patrolling as 'hunting'. However, Buffy used the term 'hunting' herself throughout the first season, and even as late as the fourth season Willow wishes her 'happy hunting' without Buffy thinking anything of it.
Correction: The first season is set four years prior to her encounter with Dracula. Buffy doesn't think of what she does in those terms any more - Willow's offhand comments don't change that. She's surprised because Dracula has a different perspective on what she does and what she is, and it's not one that she can really disagree with.
Correction: If you look closer, you can see that Buffy is just standing by the passenger door, while Faith is getting the handcuff keys off the cop that was riding passenger, it doesn't show them getting out of the car. This explains the very next shot where they are unlocking each others' handcuffs with the keys.