Hmm, I have heard of that film, goot things only, but never seen it myself.
The famous Chaos Theory, the slightest manipulation in the start settings can cause enourmous changes in the end. The butterfly effect is a nice picture used to imaginate the principle of chaos theory, however, even smaller differences might cause even more tremendous events.
The slightest difference in angle might totally change the picture of a camera that projects it\'s picture onto a monitor which itself targets, suddenly a short ray of light becomes infinite.