Huh, I thought they did the falling/time dilation experiment on Mythbusters and found that the subjects could read the digits that were previously flashing too fast.
In many of their more sciency, less blowy-up-y experiments, they're actually quite good about following the scientific method.
If they had a large enough sample size, which when they bring in people for experiments is very easy to make large enough, then they are very likely measuring a real effect. The question is what are they measuring?