Those who were familiar with Williamburg’s south side in decades past have been known to find the neighborhood unrecognizable in recent years. It’s hard to blame them, as it’s hard to find a more salient example of the effects of rapid hyperdevelopment in Brooklyn. As such, the 1984 documentary “Los Sures, which was recently remastered for its 30th anniversary and is currently showing at Metrograph on the Lower East Side, is a remarkable document for anyone curious about the neighborhood’s past long before Starbucks franchises fought community boards for liquor licenses there and Whole Foods, Anthropologie and J. Crew were all staking claims to local real estate—all of which Bushwick residents may well find fascinating.