Other mistake: The bank clerk with the grey hair, offering the cigarette and sitting back is supposed to work in "the late 70's" according to the narration. Surprised to see him again in the audience (front right) of the panel discussion on March 14, 2008, some 30 years later, looking not a year older. (00:01:35 - 01:53:40)
Other mistake: When Otto Preminger calls Trumbo from his car to announce that Trumbo's real name would be credited for Exodus, Preminger tells him to look at the front page of the New York Times. The problem is that Trumbo has already picked up the paper from his counter and is reading before Preminger even tells him which newspaper features the article.
Other mistake: When Rezendes is interviewing abuse victim Patrick in Mitchell Garabedian's office, the books on the lower shelf behind Patrick contain reported court cases from California, New York and the Southern Reporter (covering Florida, Alabama, Mississippi and Louisiana). But the events are unfolding in Boston, Massachusetts. No small law office in Boston would have these volumes in the library, because the cases in them would have no precedent or relevance for Massachusetts law and cases.