For the English version, this Final Fantasy title had over 110 English-speaking voice actors involved with the character voice production. This surpassed Final Fantasy XIII (2009), which had over 80. At the time, it was the largest amount of the voice actors featured out of all the other games in the Final Fantasy series; however it was surpassed by Lightning Returns: Final Fantasy XIII (2013), which had about 240.
Not resolving the paradoxes before the boss battles creates new endings that are VERY much worse for Serah and Noel. They don't end happy no matter what.
Oerba is an example of what compounded temporal paradoxes will due to reality. The landscape affected will literally cease to exist until the metaphorical Gordian Knot is untangled.
As New Bodum looks the same even in 700 AF, it's likely everyone built a new place to live once they had enough time time accumulate supplies and resources.
All of Serah's abilities come from Mog. She has no magic on her own.