At 36:45 Sam Russo is seen using a torch to weld the plate on. Next scene shows a stick welder being used.
The cars driven by Nick Harbin and Detectives both have their rear-view mirrors disappear at various times in the movie.
At 48 min the car driven by Nick Harbin shows collision damage before the actual collision with the Detective's car. Further, the damage to the Detective's car is not serious enough to conclude the chase.
Boom mic shadow on hood of car at 48:45.