A sub-plot revolves around a suspect filing a restraining order against McGarrett. However, it is impossible to file a restraining order against a police officer who is acting in his official capacity. That is, you cannot file a restraining order to stop his investigation of you.
In this episode (Wahine'inola) the car that McGarrett's girlfriend drives is dark blue in one scene but powder blue in another.
Early in the episode, an HPD officer tells McGarrett that he absolutely has to release the psychiatrist Olivia. And Steve immediately listens, despite his wanting to hold her. Here's the problem - McGarrett answers to absolutely no one but the Governor. The idea that a mere HPD officer would tell McGarrett what to do, and he would actually comply, is absurd, and not at all consistent with all the other episodes in the series.