Continuity mistake: In the daytime restaurant scene between Ben Affleck and his wife, the wife tells Ben Affleck that they are going to dinner that evening with two friends, one of whom is Carl and other a woman. However, later that evening the dinner date is with the wife's parents. The wife's father's name is Steve, not Carl.
Factual error: When Jackson removes the wheel bolts from Affleck's car and Affleck crashes, the airbags on the Mercedes come out but when Affleck is out of the car the airbags are still fully blown. When airbags are activated in reality they inflate then immediately deflate, the idea being that you hit them as they deflate, cushioning the blow.
Deliberate mistake: After Doyle and Gavin agree to meet at the court (right before Gavin's second highway crash), there is a scene of a taxi driving on the left side of the road. This shot was obviously flipped, as everyone in the U.S. drives on the right-hand side of the road.
Revealing mistake: On the FDR, when Doyle tries to thumb a ride in the rain, the only vehicle using wipers in the 'downpour' is the one that passes Doyle. All the other vehicles in the background driving northbound on the dry FDR are not, and in fact driving beyond the reach of the crew's artificial rain in the foreground.
Continuity mistake: When Doyle's car hits the sand-filled barrels, the front tire has a rather small hubcap and the back tire's hubcap is a different style and quite larger. A moment later, when Doyle inspects the damage to the car, in the close-up the front tire now sports an identical hubcap to the back tire.
Continuity mistake: When Doyle and Gavin collide on the FDR, Doyle's car hits the sand-filled barrels and ends up at the center of the chevron stripes on the median island, as seen in the overhead shot. When Gavin has the second accident, he walks over to Doyle's disabled car which is now at the right of the chevron stripes, closer to the exit ramp.
Continuity mistake: After Affleck's car strikes Jackson's and comes to a halt, an overhead shot shows his driver's side door only a few inches away from the plastic barrels in the median. In the next shot, Affleck opens the door a couple of feet, enough to exit easily. The median barrels are filled with sand. It would be impossible to push them away with a car door.