Live from Telluride, Sony Pictures’ biographical dramedy “Saturday Night” has officially entered the Oscar race thanks to its superb ensemble, sizzling script, and expert craftsmanship. The film drew significant attention at the festival, where nearly 300 people were turned away, and the first attendees arrived as early as 2:30 p.m. for the 7:15 p.m. screening. Jason Reitman’s…