Corrected entry: The tombstone of his wife says Dec 15, 1988 to Oct 15, 2018 which makes her 29. Their daughter is 17-18 which put her at 12/13 when they had the oldest daughter.
Corrected entry: For some reason in the first several episodes of the second season, a burst of red mist is added whenever an enemy is shot by the SEALs. The human body does not produce a mist of blood when hit by a projectile.
Correction: "If the object impacts liquid blood, the larger surface area will collect more blood, producing drops of varying sizes. Gunshot injuries -‐ mist-‐like spatter caused by bullets entering and exiting the body. When blood is impacted, droplets are dispersed through the air." From http://www.forensicsciencesimplified.org/blood/BloodstainPatterns.pdf.
Corrected entry: Lt Commander Blackburn is a navy guy; Lt Commander is a rank only in the Navy, while in the other armed force the same rank is called Major. However, in most of the action he is wearing a US Army uniform.
Correction: All members of DEVGRU are allowed to use the army ACU and does this often, especially when deployed to the middle east. This is not an error but actually a nice detail from the producers.
Correction: The date on the Tombstone is Dec 15 1983. Which makes her 34. Emma is 16/17 as she is about to leave for college, which puts the age Alana gave birth to her at 17/18 which is not that unrealistic.