Brian Williams shrugged off his cameo in “Page One” at the premiere on Tuesday. He’s criticized in the documentary, about the New York Times media desk, for a “Nightly News” report last August, when combat troops were withdrawing from Iraq, which made it seem like fighting was over. Times editors blasted the report as “hallucinatory.” “What we saw [in the film] slightly differed from the truth,” Williams explained. He was brighter about his daughter, Allison, who will star in HBO’s “Girls.” Williams confessed, “I’m trying not to be a stage dad.” Meanwhile, documentary star Brian Stelter stepped out for the first time with his new girlfriend, CNBC’s Nicole Lapin.