Jim Sullivan writes that, in addition to being a good movie, "Gone Baby Gone" gets the Boston details right:

... This isn't Newbury street and art galleries; this is Dorchester, with some Southie, Roxbury, Everett and Chelsea. ... Ben Affleck - the co-writer and director - has the Boston details down, and the actors nail the accents, especially Casey - who certainly proves he wasn't cast out of nepotism. ...