When Sasha is holding the gun on Ruth in the car, the hammer is cocked. Then in the immediate next shot, the hammer isn't cocked.
The Home Secretary's driver would be a professional trained in protection and evasion. He would have done everything possible to get the car away from such an obvious threat, not stop and get out of the car. Also, he would have a police escort.
When Sasha is reading the confidential CIA files on Coaver's laptop, Elena's birth date and weight are shown in the British style (dd/mm/yy and stones), not the American format (mm/dd/yy and pounds).
A Marine Security Guard detachment member would not have his rifle equipped while standing watch unless there was an active emergency at the time.