“When I first heard about Son of Rambow, I assumed it was going to be a very broad and stylized joke-a-minute comedy at Rambo’s expense,” Sylvester Stallone has told L.A. Times guy Mark Olsen. But the aging action star “took a look at the playfully rambunctious tale of two boys in 1980s small-town England,” Olsen says, “and liked what he saw.” Stallone explains that “the fact that it was so heartwarming is the result of brilliant filmmaking by its creators.” Wait…are the last three words in that sentence necessary?