Factual error: At the Western Front camp near Washington, you can see tanks moving with their cannons raised to the highest angle. In reality, tanks move with their cannons in a horizontal position. The cannon is raised only when it needs to hit a high target, such as a high floor of a building.
Revealing mistake: When Jessie falls on her back in the breaking into the White House, you can see she is surrounded by complete bullets, perhaps blanks. One would expect the floor to be covered with used bullet cartridges. (01:35:00)
Audio problem: When inside Washington D.C. and the AH-64 is firing its gun, the sound is completely wrong. In the movie, it sounds like a laser gun, and in reality, it's a M230 chain gun, which sounds different.
