Three minutes into Michael Walker’s film “The Maid’s Room,” Drina, a young, undocumented immigrant from Colombia, arrives in the Hamptons for a summer job as a maid for a wealthy white couple with a teenage son. The Lobster Grille Inn and Main Street in Southampton make fleeting appearances before Drina and her boyfriend arrive at an imposingly gated property. “It’s Drina. The maid. Remember?” she says nervously to the speakerphone. The gates open, and the drive leads to the Crawfords’ sprawling home.