Factual error: The insignia worn by the submarine crew is inaccurate, including the lack of a white patch behind the trade badges and a strange made-up version of the White Ensign. Also the Submarine service emblem of two heraldic dolphins has them facing the other way.
| All season 1 mistakes | Mistakes | |
|---|---|---|
| Show generally | 12 | |
| 1 | Episode #1.1 | 0 |
| 2 | Episode #1.2 | 0 |
| 3 | Episode #1.3 | 0 |
| 4 | Episode #1.4 | 2 |
| 5 | Episode #1.5 | 0 |
| 6 | Episode #1.6 | 0 |
More mistakes in Vigil
Trivia: Instead of the Royal Air Force, the series has a fictitious British Air Force with largely invented insignia. Ranks are taken from the RAF, but sometimes different rank insignia is worn (e.g. an air vice-marshal wearing air marshal's insignia and a flight lieutenant wearing flying officer's insignia, although another flight lieutenant wears correct insignia).