Adaptation Displacement: The film is much better known that the original play. It's not particularly surprising given the differences in the medium, the all-star cast and the general improvements Mamet made in the film.
Crosses the Line Twice: The constant berating is nothing if not unique, which makes some of the insults stinging and hilarious, such as Roma's disdain for an Indian client, stating that he was so stubborn, not even the Indian gods could get him to sign a deal.
Ho Yay: Roma's seduction of a customer isn't subtle.
Misaimed Fandom: Not only is the film loved by the very Salesmen it sets out to destroy, but Blake's scene (which is intended as characterizing pretty much everything wrong with corporate America) is used as a motivational tool in workplaces. Of particular note is a Cracked.com article (see Memetic Mutation above) where the author pretty much uses the scene to describe how one might become a "better person", when David Mamet has openly said he intended that scene to show what was wrong with rampant capitalism and cutthroat sales tactics. To be fair, David Wong also emphasizes a lot in his article that making money alone doesn't make you a better person and explicitly uses the scene as a metaphor (his point is essentially an Anvilicious "It's not who are, it's what you do" message).
One-Scene Wonder: Blake's scene in which he completely berates the office staff for their failure to perform. Especially notable as it's original to the film adaptation.