In all of the scenes depicting President Nixon on the phone in the Oval Office, Nixon's actual voice is heard from White House tapes.
In his memoir, Daniel Ellsberg claimed that walking out of RAND with the Pentagon Papers (and returning them) over the course of months was a calculated risk, since he had never had his bag checked by security, but he did not know for sure if it was not policy to do so.
In scenes involving the Pentagon Papers, Daniel Ellsberg's original documents were used as props, including the pages that were scattered over the floor of Ben Bradlee's home.
Steven Spielberg wanted to have his film released as quickly as possible given the parallels between its theme and the burgeoning political 'fake news' climate in the U.S. at the time. According to Meryl Streep, filming started in May (2017) and finished at the end of July (2017) and Spielberg had it cut two weeks later, an unprecedented feat. The gestation from script to final cut lasted a modest 9 months - all within the year 2017.
Tom Hanks is an aficionado and collector of vintage typewriters, and he tried out every one of the typewriters in the Post's newsroom during the shoot and took one of them, a Corona Zephyr, for his own collection. 'I tested every single one of those machines and I picked out the one for me," he said. "I informed the prop department, I'm either buying it or stealing it - it's up to them."