When Pete talks to Miranda for the first time after the murder, and is crouched with his back to the cell door, two plastic cups are on the floor. As he rises, the cups have changed positions. One is lying on the floor, facing Pete.
When Miranda flees from solitary after seeing Chloe and crashing into the two guards, she falls backwards with her head towards the solitary. In the next shot, she is lying the other way around, fighting.
At the end of the movie, they are supposed to be in New York City. However, as Chloe is getting into the cab, you can see a (partially burnt out) Tim Horton's sign in the background. Tim Horton's is a Canadian coffee shop not found in New York.