over all, zero hour wasn't the continuity bastard that crisis was, but it had its minor lil "my way" moments -- all of which was written into the storyline. the then-really-crazy hal jordan / parallax character was the one doin all the fixin up, going through time (and space!) righting things he thought was wrong, and screwin up a bit of time in the process.
it did make for a very cool "issue #0" idea, but... many of those were crap. some, like one of the batman ones, even contained a new timeline, to detail how batman's career could be entirely squished into 10 years, as mentioned above.
for example, the several year long knightfall-quest-end saga was now wrapped up in a tidy 6 months. broken back? feh! and robins were zoomin in and out like nascar!
other such inexplicable changes included bruce wayne no longer knowing who killed his parents -- joe chill was "undone."
huzzah!
