Steed's fencing stunt double has noticeably longer hair, especially in the back, which is the side towards for most of his screen time.
The car with Ivan driving and Emma as the passenger was being driven by Ivan on the left side, though British cars are right hand driven.
When Steed watches Ponsonby announcing to proceed to more serious matters (deadly combat), a shadow of a boom mic can be seen above him and Olga.