Continuity mistake: When the load of lumber is dropped on Captain Greer's 1968 Ford Galaxy 500, the car turns into a beat-up 1960 Oldsmobile just before it is squashed.
Continuity mistake: 9-4 "Man on Fire": McGarrett's blackboard already lists plutonium as the poison source before Dr. Ormsbee enters to inform him that plutonium was the poison source.
Visible crew/equipment: When Reed asks Walters how many kids he has, the moving boom mic casts a shadow on the lockers at the top, left side of the screen. It appears again a few shots later. (00:00:50)