When the unknown person who has been threatening Five-O's personnel calls McGarrett for the second time, he says that the intended victim "could be Danny," and asks whether they've checked the trunk of Danny's car. McGarrett asks Danny where his car is, and he responds that it's parked out front. The car that they then go to check out, however, has the same license plate (ending in -3954) as the car Kono is shown driving earlier when he investigated the photo album.
When Steve arrives at his office and receives the phone call it is pitch dark out, yet when he calls the editor at the newspaper per the callers instructions it is clearly daytime at the editor's office.
As the governor comes downstairs, Cameron shoots him from almost point blank range with an automatic rifle. This would have at least badly wounded the governor. Yet, because he was wearing a bullet proof vest, nothing happened. A bullet proof vest would not have protected the governor like that.
After McGarrett discovers who the victim is, he gets another call. Instead of hitting Record and Play at the same time, he hits Record and then Play, so the tape machine is not in recording mode. Yet when he rewinds the tape to listen to the conversation, it has been recorded.