For the flash videos on my site, the UI requires me to add 25 pixels to the element size. So 640x400 becomes 640x425. Maybe this is what you're seeing.
This pack contains 25 different vegetations, all based on real-life foliage photos. All textures have maximum of 4k resolution :) You can get it here: http://u3d.as/ig8
hi my advice to you would be to increase the frame rate to around 25, then extend the range of frames in some of your movie clips too give smoother transitions.
I'd be happy to pay an extra 25-50 for that book in a colectors ed box. Or just on its own in a book store. That would make just as much cash as the game...