First off, let me just warn everyone here, Lego's cheating a little bit. But, seeing as how the race is so unbalanced to begin with, that's probably okay. And, in the end, there's sort of a physics lesson to be learned, so I guess we're all winners.

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Now, I'm actually not totally certain about the physics lesson being given here. The host suggests the Lego car was able to out-accelerate the rolling 911 because of its less mass, but, as astronaut David Scott showed us on the moon, mass is not a factor for gravitational acceleration:

If I had to guess, I'd say the Lego car was able to out-accellerate the Porsche because of less mechanical rolling resistance and air resistance, due to its much smaller frontal area. Maybe I'm wrong? Any physics-types want to chime in?