An excellent quality animation with only 2 flaws.
Those flaws are pretty simple.
The first one is that there was already a cartoon on TV called Time Squad, it was about time travellers who went back in time and fixed historic events that went wrong. :P
The second is that although this is BRILLIANTLY scripted, when people talk there is very little body language, for the most part mouths just move, well, everyone except blockhead, he moves a lot. :)
Dispite those two minor flaws this movie is greatly excuted and I look forward to the other parts, I predict good things for this movie, well done!