Factual error: The Corvette owned by Bentwood is not a Z06 as shown in the movie. It is a 2014 C7 Stingray and can be identified by the Stingray logo on the side of the car.
Character mistake: A radio report refers to a character with two different police ranks with 15 seconds apart in the same broadcast - first as a Police Chief and a few seconds later as a Captain. (00:21:28)
Continuity mistake: Fairly early in the film Spenser is beaten pretty badly by four cops which lands him in the hospital for cuts and bruises, many of which are on his forehead and left side of his face. From then on throughout the movie is face is either cut badly or not at all.
Continuity mistake: When Driscoll is walking out to his car with his son, you see the driver's side window is rolled all the way up. When he sees Spenser and goes to talk to him, the window is now rolled down, even though he didn't do anything. (01:22:00)