Corrected entry: Xander is visited by what he believes is himself from the future. We later find out it is a demon that used to be a man, but Anya had changed him back in her demon days. But when Giles destroyed Anya's pendant in 'The Wish,' it supposedly reverted all of her previous spells, which should have made him human again.
Corrected entry: In 'Hell's Bells' the only part of Dawn's conversation Anya could have heard is "...he's just run off and no one can find him". Given that she had already been told the cleric had run off to perform a C-section how does she instantly realise that it's Xander Dawn is talking about? Shouldn't her first thought be that Dawn is talking about the missing cleric?
Correction: Well, if she thought the cleric had left for a specific reason, she wouldn't expect anyone to be trying to find him - as they knew where he went, so it couldn't really be him that Dawn was talking about. Xander is the only other male who is essential for the ceremony, plus the fact that she knows him well enough to suspect he might suffer from cold feet.
Correction: The demon in question was trapped in another dimension when the reversal occured, and as such might not have been affected by the spell. We've seen several times throughout the series that different dimensions work in very different ways (for example, the time-flow in "Anne"), so it's not definite that magic would cross over between them.
Shay