In the Co-op prologue, Archer and Kestrel are killed by Andriy Kobin. In the 2nd level of the single player campaign, several of Kobin's men are discussing how they planned on selling Archer and Kestrel's equipment on the black market, one of them remarks that the goggles had brain matter all over them, however, when Archer and Kestrel are killed, they aren't wearing their goggles.
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Pieces of gear Susan as Mr. Fisher's radio and the night vision goggles both he and other operatives use glow. This would defeat the purpose of stealth.
The U.S. flag hung vertically in the White House room with the vice president is backwards. The blue field should always be in the upper left.
At the end of the demo when Sam shoots the man holding a hostage he shoots him on the face. The sound his weapon makes is loud and not silenced. Earlier the same gun was silenced.
Lambert's recording starts playing a second before Grimsdottir actually presses the button.
Mr. Fisher puts C4 on a helicopter to destroy it in the event that it is scrambled to attack him. Not only is the C4 in an obvious place, but since he has to take out the guards to place the C4, it is likely that the flight crew would suspect sabotage.