It indicates nothing. Seriously. Detecting deception is just a bit more diverse than that. I'll give you an example. When Eddie is asked whether he thought MJ would want the songs released (7:10 on 2nd video), he says yes. However, his head says otherwise. Go and have a look.
I agree. People do not need degrees in lie detection. Think about it--throughout peoples lives interacting with others, they use different strategies to determine the truthfulness of friends, enemies, bosses, etc. The last time I did jury duty, in New York City, the defense attorney questioned us and told us to look at the witnesses "body language" while they gave evidence to determine the truthfulness/merit of their responses. Now, this was a case about police officers charged with burglary. Now the defense knew we were not "Detection Experts." The point is that people evaluate these things all the time--whether their conclusions are "accurate," is another thing.
more than accuracy how about "bias"?
all of us have an opinion about this subject and we bring our bias into this "human lie detector" situation. as none of us can claim to be neutral we really cannot objectively determine whether they were lying or not.