Other mistake: In the morgue, officer Thorsen says that Harper can use his reservation at a certain restaurant that evening, and she texts James to ask him out. But Thorsen never told her the time of the reservation, and yet she manages to tell James that it is at 7 pm. (00:22:40)
Continuity mistake: Austin and Tamara are standing and picking out snacks at the attorney's office. Lucy walks up, and Austin and Tamara turn around. His hands are by his side. When the camera angle changes, his hands are in his pocket. (00:18:29)
Character mistake: When the sergeant's partner gets shot and Chen calls it in, she says he got away in a black Buick, but the car was a Honda Civic. (00:10:52)
Answer: Window tool.