Agent Smith shot in right arm disappears.
While in the motel room, Agent Smith pulls her jacket on over bare arms and exits room (on the way to,..) The next scene she is wearing a long shirt under the jacket.
Towards the end when Smith enters the building her rifle has no rear sight on it. She later hands it to the ranger, still with no sight but when he uses it there is a telescopic sight on it.
The reception of the 'hotel' the leads stay in has a big sign in the window saying 'Suffolk County Council', which they make no effort to conceal in a number of shots.
Agent Smith called the Police Officer in charge "Lieutenant". There are no Lieutenants in the British Police Force. Also, she pronounced it "Lootenant" but she was English, and in London, so she would have pronounced it "Leftenant".
After fist fight in motel room there is camera/crew reflection in the mirror as ranger walk towards to pickup his hat.