Loosely derived from the book of the same title by the late Vito Russo, Rob Epstein and Jeffrey Friedman’s entertaining and instructive 1995 documentary about filmic representations of gays and lesbians goes beyond its source in equating “the movies” with mainstream Hollywood. But the clips and the intelligence of the commentaries—from two dozen interview subjects, including actors Harvey Fierstein, Farley Granger, Shirley MacLaine, Tom Hanks, and Susan Sarandon, and writers Richard Dyer, Susie Bright, Arthur Laurents, Gore Vidal, and Paul Rudnick—keep this lively and absorbing. Lily Tomlin delivers the narration, which was written by Armistead Maupin. R, 102 min.