Change Blindness

Harvard Medical School says we don't pay attention to changes in our environment, or something like that:

http://www.nytimes.com/2008/04/01/science/01angi.html

Visual Demonstration: http://www.youtube.com/watch?v=38XO7ac9eSs

75% of people do not notice the switching of the actors. Makes you wonder about any conviction based solely on eyewitness testimony.