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: After Buffy smashes Larry into the vending machine, a Diet Dr Pepper comes out. However you can see in earlier shots that there is no button for Diet Dr Pepper.
Correction: All it takes is for the person stocking the machine to place the wrong drink in the machine for this to happen. I've worked at one place where you never got what you ordered from the machine because the supplier kept stocking it wrong. In fact, in Graduation Day Part 1, Willow says: "Oh trusty soda machine, I push you for Root Beer, you give me Coke."
Corrected entry: When the gang are in Buffy's house and she sees the picture of herself standing alone, instead of saying the line "I would never wear that low apparel" she fluffs her line and said "I would never wear this that low apparel" The shot changes between the words "this" and "that" so it looks like they tried to cut out the mistake in words but didn't succeed. (00:26:30)
Corrected entry: In the season two episode 'Halloween' only the people who got their costumes from Ethan's store are meant to change into what they are dressed as when the spell is cast. However, Xander changes, despite having told the girls in an earlier scene that he got his fatigues from an army surplus store - not from Ethan's.
Correction: He bought the toy gun at Ethan's and it had the curse.
Correction: The vampire who came rushing in for Angel to fight was one of the spell-affected humans. Only appearances and behaviors changed the humans. None of the supernatural "rules" apply so that person with more or less a glamour prohibiting their own control wouldn't need an invite.