Michael picks up two coffee cups together but when handing the coffee to Pearse there's only one.
Towards the end when Michael goes to see Agent Pearce, she is on the phone, so he goes to pour her a cup of coffee. When he grabs a coffee cup, two actually stick together and he pours the coffee in them. when he turns around and hands Agent Pearce the coffee, it is only one cup.
Ethan was supposed to have been a U.S. Army Special Forces sniper. When introducing Ethan to Fiona, Michael addresses him as "Lieutenant." Snipers are enlisted personnel., not officers.