From 1970 to 1976, Al Eben played Doc Bergman. In one episode "A bullet for McGarrett", his name is Doc Abraham.
When Dr. Farrar meets with Wo Fat at the overlook, the sun is shining toward the ocean and no shadows, e.g., of the railing are visible. Yet when Wo Fat leaves, apparently a few minutes later, the sun is on the same side of the railing as the ocean and its full shadow is visible on the ground -- something that would be possible only after far more time had passed.
Along with the hypnotic gibberish which is the main plot, Dr. Farrar also claims that much can be discerned about a person's psychological traits by looking at least their hands. The only thing missing is phrenology.
The powder that spilled from the girl's purse has changed location when McGarrett finds it.