When Billy is walking by the bank, a late-model Dodge Ram can be seen reflected in the window.
The film is set in 1983.
The Mercedes Benz used to leave the garage is a 1987 model. Also, even if it were a 1983 it is in really poor condition. Also the car is equipped with a detachable face CD player. While CD's were commercially available in 1983 detachable face players were not.