When one of the British sailors fires on Chandler's team a closeup of his sidearm is shown before he fires, the slide is locked open indicating that the pistol is empty and there is smoke as if it had already been fired.
Wolf Taylor is introduced as a senior chief petty officer. There is no such ranking in the Royal Australian Navy.
In the control room of the British submarine the helmsman is shown operating a traditional yolk for steering and depth control, Astute-Class submarines do not have this arrangement.
A closeup is shown of Lt. Green switching the safety on his M4 off, but it only has two options: safe and semi-auto. The M4 is a fully automatic rifle and has four different fire modes: safe, semi-auto, burst (fires three rounds) and full auto. Since the rifle shown only has the two fire modes that means they are likely using an AR-15 as a stand-in for an M4 as they are much cheaper.
Lt Ravit Bivas is not following IDF Uniform regulations. She is wearing a white undershirt under her work uniform and as an officer, she is only allowed to wear a green undershirt. In addition, she does not have a beret under her left shoulder board or wearing a hat as uniform regulations require. A third violation is found towards the end of the episode when she has her hair loose. As an Officer in the Israeli Navy, she would not make these mistakes.
Onboard the British submarine one of the crew remarks that they will never get back to their base in Faslane but pronounces it 'Fas-lin' rather than 'Faz-lane' - no British submariner would ever mispronounce the home of the UK submarine fleet.