While The Beaver was yielding some positive feedback after its screening last night at SXSW (Nikki Finke wrote, “the film received what was described to me as a very strong ovation at the end,”), Mel Gibson was turning himself in to the El Segundo Police Department in Southern California. It was probably as unpleasant for him as missing a Ke$ha concert because we were in court fighting a fine for taking our trash out on the wrong day would be for us. His mugshot and fingerprints were taken by authorities, and he was released after he posted 10% of his $20,000 bail. Gibson’s booking comes…