Continuity mistake: When the man who was hit by a driver while on his bike, was being taken to the trauma room he is bumped by someone and blood starts spurting everywhere, including on Maggie, who is wearing Abby's coat. In the very next frame, the coat is clean with no blood on it at all, with no time for Maggie to have changed the coat.
Continuity mistake: When Carter and Abby drive up to the motel that Maggie is holed up in in Oklahoma, the rental car they are driving has no front license plate. When they pull up to Abby's apartment the next evening, in the same rental car, there is a front plate on the car and the plate is from Illinois.
Continuity mistake: in the scene where Dr. Benton is getting Reese ready for day care in the staff lounge and is talking to Dr. Finch, the shot shows Reese with his left hearing aid out of his ear, hanging down then when the angle changes it shows his hearing aid back in his ear without Dr. Benton putting it back in or touching it at all. (01:33:45)