Mr. Laub, who didn't disclose any potential acquisitions from Tribeca, singled out a few documentaries for attracting strong interest from his colleagues, including "Don't Stop Believin'" and two titles that focus on social issues: "Burn, " an audience award-winner about Detroit fire fighters, and "Revisionaries, " which won a special jury prize for its close-up on the ideological battles dividing the State Board of Education in Texas.