When Zoe is looking for Frank on the Cathedral Heights metro platform, a station list is seen on the wall across the tracks. It clearly lists the stations of the Baltimore Metro, starting with Johns Hopkins Hospital on the left, then Shot Tower, etc. They added signage for a fictitious Cathedral Heights station in DC, but neglected to correct the station list sign. The scene was clearly shot in the Baltimore Metro system, not DC.
Frank points to a photo of Lyndon B. Johnson and Martin Luther King, Jr. and incorrectly says it was the Civil Rights Act of 1963, when it was 1964.