Under the newspaper headline "McGarrett Fights Back" the following news story has nothing to do with McGarrett or Five-0.
When McGarrett returns to Cathi's house after calling in the murder, in the close-up shot of Cathi (Camilla Sparv)'s body the muscles in her neck could be seen moving while she was breathing.
About three-quarters of the way through the episode, Danny Williams and Steve McGarett are driving, with Danny acting as the driver. During most of this sequence, the top of someone's head can be seen moving around in the backseat on McGarrett's side of the car - presumably a member of the crew who had some role in the filming of this sequence.