After Yancy Butler's character is introduced, she's seen in during the auction wearing what appear to be black heels. After she fights with Sierra and knocks her down the stairs, you can see Yancy running away clearly wearing black sneakers.
Throughout the film, Yancey Butler's character, Hannah, is shown alternately wearing high heels and sneakers, but she is never seen changing her footwear. This occurs more than once.
During the scene at the exhibition, the lady in red's black bra is showing on the left side by a couple of inches. Several lines into her conversation with the lead, it suddenly disappears.
The US flag patches worn on the soldiers' sleeves are the wrong way around - the stars should always face the front, as if the flag was flying from a staff carried by the soldier.
The armored personnel carriers driven by the American soldiers are in fact Russian BTR60s or BTR80s.
The fire truck that pulls up to the museum is European. This museum is supposedly in Colorado, USA.