Thank you very much for watching and replying, Emong!
About the flashes and effects: I didn't want to do an effect for every single beat of the song because I thought it might take away from the meaning, but maybe I was wrong.
The action sync: Ah, yes. I realized that was in the back in my mind now that you pointed it out. I tried to concentrate on matching the lyrics up to the video
too much maybe. It's possible I could have just chosen a different scene so people aren't like "Hey, how did it go from that to
that so quickly!?"
I will definitely take those things into consideration, especially if I make another Advent Children video. Thanks for the descriptive and friendly advice. I'm sure it will help me out a lot.

I need to know what I'm doing so I can make things right.