A flashback scene shows Maya asking Shane to check a bullet for her but she hands him a plastic bag with a shell casing, from which a bullet is expelled, not the bullet itself. The casing wouldn't have the striation that the fired bullet would have and is therefore of much less use in ballistics.
When the protagonist asks her friend to check the bullet for a match with the one she fired from the range, she hands him a plastic bag with a shell casing in it. In fact, she would have had to go to the end of the firing range and somehow retrieve the bullet she had fired, an almost impossible task. This is because bullets are matched to the unique scratches and grooves from the barrel they pass through, not the discarded shell casing from the breach.
In the flashbacks, Maya is wearing gel overlays on her fingernails, while piloting the helicopter. That would not be allowed on active duty.
Maya is shown as the pilot of the Apache, but the pilot sits at the back seat.
She does carry out the role of the Weapons officer who does sit at the front.
The character Shane is supposedly a member of the Army's Royal Military Police. In this episode, whilst being seen in uniform, the cap badge is not that of the Royal Miltary Police. In a previous episode he also wore the beret with the cap badge above his right eye. ALL UK service personnel wear berets with their cap badge over the left eye.
Maya told Luke and Izabella to "Get in the trunk" but (a) it was pickup trunk so the rear bed isn't a trunk and (b) she is British and would have called it the boot.