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.
You mean the entertainers whose show, at the very basest level, is a show about doing (often) high-budget, high school science fair projects?
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?