ABC’s George Stephanopoulos either doesn’t go to the movies much or isn’t familiar with the greatest basketball players of all time. During Monday’s telecast of President Obama’s inauguration, a camera captured Celtics great Bill Russell in the crowd. Even though the 11-time NBA champ was wearing a Celtics hat, Stephanopoulos still managed to misidentify him. “That’s Morgan Freeman, I think, right there on the Capitol steps,” Stephanopoulos said, referring to the five-time Oscar nominee. “No, Bill Russell, I’m sorry.” The networks had an easier time identifying other celebs in the crowd, including John Mayer, Katy Perry, Beyoncé, and Jay-Z . . . Governor Deval Patrick and other Massachusetts Democrats hosted a pre-inauguration party at Legal Sea Foods in D.C., and the guests included senators John Kerry and Elizabeth Warren, former congressman Bill Delahunt, and congresswoman Niki Tsongas.