Everybody in every country speaks fluent English with North American accents.
Agent 47 does not change his accent when disguising himself.
In Mission "Mumbai" the cars are constructed to fit right-hand traffic. However, India has left-hand traffic.
Agent 47 can shoot cameras in order to avoid the attention of security; if this were done in a real-world scenario, the operator or operators of the cameras would be alerted that something was amiss.