“Guardians of the Galaxy,” Walt Disney Co’s offbeat space adventure featuring extraterrestrial misfits and a talking raccoon, took $94 million in U.S. and Canadian ticket sales this weekend, setting a record for a film opening in August. “Guardians,” which stars some of the lesser-known characters in Disney’s Marvel comic book universe, outdid last weekend’s leader, the science fiction thriller “Lucy” that collected another $18.3 million in sales at domestic theaters, according to estimates from Rentrak on Sunday. “Get On Up,” a biography of the soul singer James Brown, finished third with $14 million during its first weekend in theaters.