Watch East LA Interchange (2015) : Full Movie Online Free East L.A. Interchange follows the evolution of working-class, immigrant Boyle Heights, the oldest neighborhood in East Los Angeles from multiethnic to predominately Latino and a cradle of Mexican-American culture in the U.S. The documentary tells the story of how one neighborhood managed to survive the construction of the largest and busiest freeway interchange in the nation and explores the shifting face of community in the United States today arguing why it should matter to us all.