 GEOG: SPOILER: Toward the end of the film, after the Bruins game,  Dillon tells the driver to take the expressway south out of Boston;  they subsequently end up in the parking lot of a fairly well known  bowling alley in the Dorchester section of the city, where Dillon  murders Coyle. Only problem is, on the way to Dorchester, they can  be scene traveling through a rather lengthy tunnel on the way to the  alley. The only tunnel in those days that they might have taken,  would have taken them north out of Boston, and they would have ended  up many miles from the intended destination.