In the episode 'Passion' Angelus destroys Jenny's computer before he kills her, hoping to get rid of the hard drive with his cure on it. Two episodes later in 'I Only Have Eyes For You' Willow tells Giles she found lesson plans on Jenny's hard drive. If the hard drive was destroyed with the computer she wouldn't have been able to retrieve lesson plans, but if it somehow survived the damage Willow would have found the curse when she looked through the files. Either way it's a mistake. [Having dealt with far too many fried hard drives in my day, I can tell you that it's entirely possible the sector of the hard drive that contained the spell was damaged beyond recovery, but the sector with Ms Calendar's lesson plan was not. Just because you can find one thing doesn't mean you can find everything.]

In 'Graduation Day, pt 2' Percy and guys who are presumably other students are fighting at Angel's side, but shouldn't they have been at the ceremony with the others? Even if they just didn't show up there would have been noticeable gaps in the seating, but in all the previous shots every chair is filled. [Buffy would have used other students from within the school to fill in certain seats (probably at the back where it would be harder to recognise them).]

In 'Graduation Day, Part 2' all the parents run for their lives after the Mayor ascends. Doesn't a single one of them worry about the kids they're leaving behind or try to get them to run too? [Wouldn't the kids have explained the situation to them? After all, you don't normally take a weapon to your graduation, and you would be smartly dressed for the occasion.] Corrected by Andy Benham

Buffy manages to get right into Faith's apartment and has to turn the stereo off before Faith notices her there. In that amount of time and if Faith is being that oblivious, Buffy could have easily killed her by throwing the knife or using a crossbow, etc. [That's what separates the heroes from the villains: A hero will kill as a result of a fair fight, while a villain will do it from behind. It took nearly a hundred years before snipers were openly welcomed in the US military.] Corrected by Rlvlk

The Mayor, near phobic about germs, doesn't even react when Faith picks up a cookie in his office, takes a bite out of it and puts it back in the pile. Someone as obsessive as him would surely hate the thought of half-eaten cookies being mixed with the fresh ones. We know he plans to keep the cookies since he covers them over with clingfilm later in the scene. [This is to show how he feels about Faith.]

If even Faith can instantly realise that the gang would be willing to trade the Box of Gavrok for Willow's life, we can assume Willow knows it too. Why, then, when she escapes from the locked room in Town Hall, does she hang around to read up on the Books of Ascension? If she had escaped they could have destroyed the box, and the Mayor's plan would have been stopped, whether he had the books or not. [Willow knows from the gang's reconnaissance that all the entrances and exits from the building are guarded, but there are few if any guards within the building itself. If she tried to escape she would certainly be caught. Knowing that her friends would try to rescue her even if they weren't willing to sacrifice the box, she did some snooping on the off-chance that it would prove useful.]

In this episode when everyone is in the Library and they find out that Buffy can hear thoughts, Buffy turns to look at Wesley because he is thinking about Cordelia. As she leans forward she rests her chin on the heel of her hand, the shot cuts to Wesley, then back to Buffy and she has her chin resting on the top of her hand (the knuckles), Wesley then goes into the office and it cuts to a shot of Buffy and Willow, Buffy is once again resting her chin on the heel of her hands. [Buffy is offscreen long enough each time to have moved her hand without us seeing it.]

In the scene where Faith is stabbing the demon who has the Books of Ascension, we see her making the motion of stabbing him with her left hand, however, the knife is in her right. [I've watched this scene over and over and i can only see Faith with the knife in her right hand and stabbing him with her right hand. She only steadies the demon with her left hand as she goes to stab him.]

At first Anya supposedly has no knowledge of what happened during the events of 'The Wish', since she is as mystified as Cordelia to find her necklace gone. During 'Doppelgangland', however, she seems to know exactly what happened; she discusses it with D'Hoffryn and recognises Vampire Willow as soon as she sees her. [At the end of "The Wish," Anya is in a state of shock: she's suddenly lost her center of power, been transformed into a human, and jumped dimensions all in an instant. It takes her a few minutes to adjust, take stock, realize what has happened, and start panicking, all of which happens after she runs off following Cordelia and attempting to grant more wishes. No wonder she's disoriented.]

In 'Consequences' how did Wesley know that Faith would be with Angel, or where Angel lived? One episode earlier he didn't even know Angel's name. [We know that Giles has researched Angel in the past, and he probably kept this information updated, either in his Watcher diary or somewhere else. We know that Wesley has access to the diaries (we even see him reading them) and the rest of Giles material so if the information was there he just had to go back and find it. Also Xander hates Angel so if Wesley came to him and asked him Xander would likely tell him to get one over on Angel.]

How does Wesley have the exact key to fit the manacles in Angel's mansion (in the scene where he frees Faith)? We never see him picking them up or taking them from Angel. [The Council has access to many magical resources. It's quite likely they have enchanted skeleton keys to fit certain types of locks, especially given what we learn about the Council's wetworks squads.]

In 'Bewitched, Bothered and Bewildered' we see the interior of Xander's room, and a guitar is resting against the wall in the background. Next season, in 'The Zeppo', he asks Oz if it's hard to play the guitar. If he already has a guitar you'd assume he knew how to play it, or had at least tried to learn in the past year. [Xander's character isn't often driven or committed to non-life-threatening causes. In Season 5's "The Replacement," his friends comment that the Xander clone is much more decisive and determined than original Xander. It's quite likely that such a person would pick up a secondhand guitar on a lark but never follow through and learn how to play it - after all, he did fantasize about playing the guitar to impress Buffy way back in "Teacher's Pet."]

Third season, Episode 3ABB13-The Zeppo-Jack says that he couldn't raise his dead friends earlier because he "had to wait 8 months for the stars to align," but he died three weeks ago and his grandfather raised him the same night. [Jack says he was dead less than ten minutes - perhaps that affects the necessary conditions for the spell.]

If all of Giles' and Willow's books were burnt, or just drenched in water; why is it in latter episodes, his books are all in good shape? [Some or all could be replacements.]

It is revealed by Buffy that no one knew anything about the two dead children i.e. their names, where they came from, who their parents were etc. So, where did the photographs on the placards come from? [Buffy also asks where the pictures came from in the same scene she wonders about the children's origins.] Corrected by JC Fernandez

In 'The Wish', considering the necklace is the source of all Anya's powers she's fairly careless with it. She puts it around Cordy's neck and lets her take it into the Bizzaro World, where it could easily have been smashed during either of the vampire attacks. In fact, if it hadn't been for Giles the necklace would have been incinerated. [This is an indicator of Anyanka's hubris; a character flaw, not a movie mistake. As she tells Giles, all her powers are not in the wishing that the amulet allows, but do use that amulet as a power source - she may not even be aware that destroying the amulet will also rob her of her immortality and strength. The magic amulet probably enjoys some amount of resistance to heat, cold, and magical intrusion and is very valuable, making individuals who encounter it unlikely to destroy it intentionally. No doubt Anyanka has some homing connection to it that she planned to take advantage of after her tour of "interesting" Sunnydale.]

Giles says in 'The Wish' that destroying Anyanka's power source will reverse all her wishes. Surely Cordelia's can't have been the only wish that caused a temporal fold or similar history changing event? And if not, then shouldn't the world now be radically different in some way? [Cordelia's isn't the first temporal fold, but the point of the episode is that superhero Buffy has had a tremendous effect on Sunnydale. Anyanka usually deals with common women, like Cordelia, not exceptional individuals like Buffy. Therefore, past temporal folds probably dealt with small things, like cheating husbands never meeting temptresses or never being born, none of which significantly affected world history (even Cordelia's only affects Sunnydale and Cleveland). So the world is different, just not in ways that matter to our characters.]

During 'The Wish', when history has changed and the Master has risen, where are Collin, Darla and the Anointed One, the Three or any of the other favoured acolytes from season 1? Buffy never killed Collin or the Three, Angel wouldn't have killed Darla if it hadn't been for Buffy and the Master would surely have been able to protect the Anointed One from Spike. Even allowing for Angel and the White Hats to have taken out one or two of them, surely at least one of the group should have been there? This is technically the real world as altered by Anyanka's temporal fold, not any kind of alternate dimension. This is what the world would have been like if Buffy hadn't come to Sunnydale, so anybody who would be alive if it weren't for Buffy should still be alive. [Colin and the anointed one were the same person and with the prophecy regarding the anointed one being linked to the slayer, no slayer equals no anointed one, same with the three, they were only called on to take out the slayer. Which leaves Darla, who still could have either been killed by Angel, after all she was part of his destiny].

The episode, 'The Wish', is where Buffy had never come to Sunnydale and the vampires had taken over Giles knew there was a vampire problem before Cordelia shows up and tells him to call Buffy in. Giles knew about Buffy before Cordelia tells him so why didn't Giles call Buffy about the problem before it got so out of hand if he already knew of her and the problem. [The whole point of this episode is that Buffy hasn't come to Sunnydale, so obviously it would never have occured to Giles to call Buffy until Cordelia told him, or else the wish wouldn't have done its job properly.]

In the alternative universe, the residents of Sunnydale are aware of the presence of the vampires, who are killing people in horrifying numbers. So why doesn't everybody move away, as they do in Season 7 when the apocalypse looms? [One might also ask how the Master escaped the Hellmouth without ending the world, or why Giles never called for assistance from the Slayer until now. The answer is that Anyanka has some degree of artistic license when granting wishes - we see this in season 7, when she accepts a wish to turn an ex-boyfriend into a worm and actually transforms him into a burrowing beast. Anyanka thinks Bizarro Sunnydale is more interesting with humans around to kill, so she creates a world that fulfills her interpretation.]