Corrected entry: When the guards at Cable 54 ask, "do you have your authorization cards?" Nada and Frank blow them away. Nada drags the traitor over by his goatee then taps on the glass and says, "it's soundproof". This would have already been established as nobody on the other side of the window reacted to the gunshots.
Corrected entry: At the bank Roddy shoots round after round from his shotgun at the aliens. He doesn't pump the gun like he should every time he wants to shoot.