All four Soldiers at the banquet are wearing PV2 (E-2) rank. This is the rank of someone who has been in the Army for 6-12 months, or who has gotten reduced in rank. Soldiers who return from a tour in a combat zone have generally been in for at least 18 months and would be a PFC (E-3). Abby Sherman was in the Army for 4 years so she would have been a Specialist or Corporal (E-4), or Sergeant (E-5) based on her heroic actions.
While in the police station being interviewed, all of the Soldiers are wearing the Army Combat Uniform (ACU) with their collars up and closed with velcro. The collar is only worn up and secured when wearing body armor, so that the neck is not chafed. Any other time the collar is worn down like a normal shirt.
When Pvt. Lawrence is being interviewed by the police the US Army and his name tag are in the reversed position on his fatigues.
After the award ceremony Lt. Col. Casey escorts Jane to her car, without wearing a cover (hat). Anyone in the military, especially officers, know that wearing a cover is mandatory when in uniform. Indeed, all of those in uniform should have been wearing a cover when outside.
No .38 caliber weapon is currently issued by any branch of the U.S. military, nor has been for more than 20 years. No Special Forces operator would ever carry anything in .38 caliber because of its poor stopping power.
Abigail Sherman is described as a PFC, or Private First Class (E-3), in both the credits and the dialog of the show, but the rank on her uniform is that of a Private, E-2.
Although the credits list him with the rank of Sgt Major, Casey Jones is referred to in the script as a Lieutenant Colonel in Delta Force, and his uniform appears to be that of a Lieutenant Colonel with two and a half years overseas service. Someone realised the mistake, though, because he got promoted from Sgt Major all the way up to Lt Col between episodes 2.13 and 3.3.
Rizzoli determined the victim had been shot by "friendly fire" in Afghanistan because the bullet found in her was a .38 caliber. However, the .38 has been around for over a hundred years, and in use by several countries. Not to mention the plethora of old .38 revolvers sent overseas during World War I and World War II. An Afghani insurgent could easily have had a firearm in .38 caliber.
Dr Isles tells Rizzoli about "catholic guilt": "devout Catholics are more likely to show signs of OCD. Martin Luther's strict definition of the sacraments is too constraining." Martin Luther criticized official doctrine and practices of the Catholic Church, which led to the Reformation and the creation of Protestantism, so followers of Martin Luther are not Catholics.