Fredsicle
Joey Gaga
In Becoming Part 2 of Season 2, Joyce is very shocked to learn that Buffy is the "slayer of the vam-pyres'. Buffy told Willow in 'Normal Again' that she had been in an institution because of her trouble with her parents and their disbelief. Why was Joyce so shocked, wouldn't she remember Buffy's "craziness"? If she didn't believe her three years before, why did she believe her later? This sounds like it may have been a plot hole or something.
M
Miss Kitty F
It could be that Dawn's creation and altering of the timeline changed that part of Buffy's past.