As “Saturday Night Live” enters its 50th season, co-writer/director Jason Reitman wants to take viewers back to the beginning of television history. Although the authenticity of the story remains in question, the sheer energy of the pre-show event seems about right in “Saturday Night,” which depicts the 90-minute countdown leading to the first broadcast of the iconic show in 1975. Reitman focuses on kinetic movement of people and places, recreating the hectic activity inside Studio 8H, and the viewing experience is certainly a rush, following speeding cameras as they chase a large assortment of cast and crew, spending little bits of time on thoughts and fears. “Saturday Night” gets a little too caught up in some ill-defined relationships, but the overall thrust of the endeavor is thrilling to watch. The film also scores with its recreation of early “SNL” nerves and attitude, making for a wildly entertaining sit. Read the rest at Blu-ray.com