Castro Theatre.The Little Mermaid singalong: An interactive presentation of the Disney feature, with prizes for costumes. Thursdays, Fridays. Continues through Aug. 28. West Side Story: The best music and choreography to be filmed in this country, maybe ever. Some is even performed by Rita Moreno! Aug. 29-Sept. 4. 429 Castro (at Market), 621-6120, www.thecastrotheatre.com.
Dark Room Theater.Bad Movie Night:Howard The Duck: Before there was Jar-Jar Binks, there was Howard the Duck. Sundays, 8 p.m. $5. 2263 Mission (at 18th St.), 401-7987, www.darkroomsf.com.
Istituto Italiano di Cultura.Remembering Anna Magnani: A series. Tuesdays, 6:30 p.m. Continues through Sept. 16. 425 Washington (at Battery), 788-7142, www.sfiic.org.
Pacific Film Archive.The Long View: A Celebration of Widescreen: CinemaScope, VistaVision, Panavision -- it's all here in this collection of big-screen classics. Through Aug. 30. Manoel de Oliveira: Talking Pictures: A series celebrating the work of the Portuguese director. Through Sept. 28. United Artists: 90 Years: A retrospective from the studio founded by Mary Pickford, Douglas Fairbanks, D.W. Griffith, and Charles Chaplin in 1919. Through Aug. 31. Alternative Visions: Showcasing avant-garde films, in conjunction with the U.C. Berkeley course taught by Erica Levin. Sept. 2-Oct. 28. 2575 Bancroft (at Bowditch), Berkeley, 510-642-1124, www.bampfa.berkeley.edu.
Red Vic Movie House.Mister Lonely: Harmony Korine's latest is a love story set in a remote Scottish commune populated by celebrity impersonators. Wed., Aug. 27, 2, 7 & 9:20 p.m. Riot on Sunset Strip Film Festival: Aug. 28-31. Pierrot Le Fou: A new print of Jean-Luc Godard's 1965 classic. Mon., Sept. 1, 7 & 9:20 p.m.; Tue., Sept. 2, 7 & 9:20 p.m. 1727 Haight (at Cole), 668-3994, www.redvicmoviehouse.com.
Roxie Theater.Encounters at the End of the World: Werner Herzog goes to Antarctica. Through Aug. 28. Warchild: Christian Wagner's feature about a mother trying to find her daughter after they become separated in the Bosnian war. Through Sept. 4. American Teen: Nanette Burstein's documentary about teenagers in Indiana. Through Sept. 4. "Rob Nilsson's 9@Night": Aug. 29-Sept. 4. The World According to Monsanto: Marie-Monique Robin's documentary is critical of the seed corporation. Aug. 29-Sept. 2. 3117 16th St. (at Valencia), 863-1087, www.roxie.com.