Factual error: All of Tommy's former men salute him. As a sergeant-major and not an officer he would never be saluted. This is drummed into all soldiers and they'd never do it, even in civilian life. Not only is it against regulations, but many NCOs would take it as an insult.
Factual error: Grace suffers a gunshot wound to the upper left chest in the previous episode, and episode three reveals she died. The bullet would have passed under the clavicle and would have missed the axillary artery and all other major blood vessels. This wound should not have been lethal, especially because Grace's family immediately called for an ambulance, so she would not have had to wait long for medical treatment. Most of her family members are military veterans who would have knowledge to provide the necessary first aid.