As far as I know, the only moments that it were lip-synch (imo) are:
Trust you @ Secret First Live
http://www.tudou.com/programs/view/DCNMZ5oRzgM
Crank The Bass @ Bon Voyage Tour
http://www.dailymotion.com/video/x26...the-base_music
And now with HURRICANE.
We all know the girl can sing, so we all understand when she's dancing like crazy and doing her best for the choreography, and decides to lip-sync a little. We are not in denial like Ayu's fanbase.
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@maze: The footage is usually a raw cut of the DVDs footage, so the DVD will probably have the same color issues. With Bon Voyage Tour report footage, we got the colorful footage we have on the DVD.