Steed's fencing stunt double has noticeably longer hair, especially in the back, which is the side towards for most of his screen time.
When the two British men kill Boris Grotski in the alleyway, he dies on his back, with his arm extended and his hat at the end of his arm, when Steed and Mrs. Peel come across his body he is now lying face down and his arm bent with his hat above his head. and his body pointing in the opposite direction.
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.