Can’t anyone get D.C. right? Today the Post’s Reliable Source reports that Nicole Kidman’s newest thriller, The Invasion, makes a number of relatively amateur mistakes in trying to use the District as a backdrop, even though a good part of it was filmed here. Among those: – Kidman, who plays a D.C. psychiatrist, buys magazines at one of those big sidewalk newsstand kiosks — the ones all over New York but not on any corner…