Lewis tapes her mouth shut with duct tape, but leaves the roll beside her on the ground. Minutes later we see the roll in his car.
At 13:30, Lewis (Luke Evans) appears to clearly accelerate through a red light right in front of the police officers stopped at the light next to him. Yet the police officers don't seem to notice or care.
At 44:44 you can see a bump on the wall (hiding an explosive) which is detonated when gun is shot at 47:04.
At 17:42, Lewis (Luke Evans) tells Cathy (Kelly Reilly), that she's being kept prisoner in a room with "four-foot thick concrete walls," yet when he opens the door, it's clear that the walls (at least around the door) can't be more than about six-inches thick.