Looking at that page, I find it interesting classifying what photo do and don't have the tilt-shift to toy effect. The one that jumps out at me is that if you can resolve the limbs of people who are moving like in the soccer picture or a few of the streetscapes, it just looks like a strange normal picture. The way real people move, even in a still photo is completely distinguishable from toys and breaks the rest of the optical illusion.
seen this? http://vimeo.com/6037430
That's fucking awesome! I love how there is even a section of the Cornhuskers stadium mostly filled with non-red-clad people, the fans of the visiting team.