When Danno is on the phone updating McGarrett about the whereabouts of the scientist, he tells McGarrett that the Dr. was seen at a gas station between 11 (PM) and 12 AM (which is midnight); later McGarrett says the Dr. was seen between 11 (AM) and 12 noon (which is PM).
A field worker is seen reflected in water, standing still, waiting for his cue as the camera pans towards him.
McGarrett tells Williams to book Patton on two counts of murder, but it should be three: Weatherby, Gomez and Chadwick.