During the show the Jerry Franklin character wears the rank of a Private (E-2), but is addressed as a Private First Class (PFC or E-3). But in the closing credits he is listed as having the rank of Corporal (E-4).
Through out the episode Jerry Fielding's unit is identified as the 25th Infantry Division. Fielding and his buddy from Nam are clearly uniformed as paratroopers in the 101st Airborne.
When McGarrett leaves headquarters he's driving a 2-door Mercury but when he arrives at the Lo murder scene he's driving a 4-door.
The two soldiers are not only wearing Airborne uniform, but to begin with, McGarrett refers to the victim as being from the 173rd Airborne, then they are later referred to as 25th Infantry, although these units are not the same. In addition, the murdered man seems to have one stripe on his uniform with a semicircle at the base, but in the closing credits he is referred to as sergeant.
McGarrett and the Governor say that the initial victim was part of the "173rd Airborne Division", but the 173rd is a Brigade.