The overhead shots of Woodward's car driving out of the parking ramp on two occasions, weeks apart show the same people coming and going on the sidewalk and all the same cars parked the same way in the garage.
When Bernstein is questioning Judy Hoback in her home, she tells him that, "in one 2-day period, $6 million came in." In the following scene, in which Bernstein is explaining his notes to Woodward, he repeats the information as "in one 6-day period."
When Woodward and Bernstein go to see the bookkeeper the level in the pitcher of tea changes from front to back camera shots. Also the newspaper in the front of the pitcher appears and disappears between camera shots.
A brief sequence shows a 1972 Chevrolet Caprice (with four rectangular taillights) transporting a bundle of Washington Post newspapers through nighttime Washington to the White House, at least until the very last closeup shot of it passing through the gates of the White House, where it changes to a 1973 Chevy Bel Air (with two square taillights).
When Woodward and Bernstein are in Woodward's apartment, and Bernstein throws Woodward a cookie, Woodward puts it down, and the position of the cookie on the desk changes repeatedly between shots.
In a 2007 web discussion on Watergate, reporter Bob Woodward gave the following answer when asked for the biggest factual error in this movie: "The movie is an incredibly accurate portrait of what happened. To limit the number of characters, the city editor, Barry Sussman, was merged into another character. That is regretable, and something Carl Bernstein and I should have fought, because Sussman played a critical role in guiding and directing our reporting."
When he phones the Library of Congress, there is a closeup of Woodward dialing "1414". The phone number of the Library of Congress in 1972 was 426-5000. Presumably this shot was meant to show him phoning the White House at 456-1414.
In the movie the reporter (played by Peggy Fuller) who tells Bernstein that former Post employee and subsequent White House functionary Ken Clawson claimed he wrote the infamous "Canuck Letter" is called Sally Aiken. The real-life reporter's name was Marilyn Berger.
In the first note to Woodward from Deep Throat, he says to meet at 2 AM in the garage. Woodward takes a cab and gets out in front of the John F. Kennedy Center to switch taxis. At that time, there is a crowd of people leaving the Kennedy Center, as if leaving a performance. No performance at the Kennedy Center would have gone that late.
The name of the lawyer encountered by Woodward at the arraignment of the Watergate burglars gives his name as "Markham". In reality, the lawyer identified himself to Woodward as Douglas Caddy.
Woodward is typing up a story late in the film, and the closeup of the typewriter paper shows the word "criticise". When the wire teletype is printing his story minutes later, it reads "criticize". However, Woodward didn't type the story into the teletype. In 1972, that would have been done manually by someone else, who could have corrected the spelling as they went.
As Woodward is ending a call from a phone booth, a car in the street behind it slows down and two people look out presumably to watch the scene being filmed.
When Woodward is handed a photo, the woman who hands him the folder looks toward the camera as she walks off, as if to make sure she's no longer in the shot.
After Bernstein and Woodward talk to Dean about why he revoked his statement, people can be seen walking into the hallway, being startled when they see the camera, and then walking past the wall as if they could keep out of the shot.
In an early scene, a large-print poster for the album "Southern Nights" by Allen Toussaint is visible within the Washington Post building. This item couldn't have been there as the album was released in 1975 (more than two years after the dating of the scene and one year after Nixon's resigning).
When Woodward is first shown typing a story, a scene that takes place in June, 1972, a copy of "The Almanac of American Politics" is seen on his desk. However, it's the 1974 edition of the Almanac, which would not be published for another year and a half after the scene took place.
Though the movie is set in 1972, a post-1975 Ford Granada drives past as Woodward is making his first phone call to Deep Throat.
Above the desk of Carl Bernstein is a large button with the "Baltimore Bullets", NBA logo. The Baltimore Bullets did not move to the Washington D.C. area until the October 1974 season. The film covers the period from June 1972 until the January 1973. Displaying support for a sports team from the city of Baltimore would have been considered gauche by the district's sports fans in the early-1970s.
In 1972, when Woodward is calling Deep Throat at the phone booth, a 1974 Cadillac Coupe Deville drives past. It can be identified by the wide rectangular window behind the door. On prior year models the window is narrow.
When Bob Woodward first appears in court to cover the appearance of the men caught at Watergate, the voice of actor George Wyner was dubbed over the voice of the first lawyer Woodward is actually talking to in the scene.
(at around 40 mins) Woodward and Bernstein in a distant shot in the newsroom: Bernstein continues talking without pause while twice taking sips from his coffee.
While reviewing the contents of Dardas's file in the District Attorney's office.
Bob Woodward goes outside the offices of The Washington Post to make a more private phone call from a phone booth. Just as he's entering the booth, the face of one of the crew members can be seen reflected in the metal strip of the booth frame.
When Redford/Woodward goes to the public phone booth to contact 'Deepthroat' for the first time, the face of a member of the camera crew can be seen reflected in the shiny steel doorpost of the phone booth.
At one point, Woodward is shown driving east in front of the White House, but then ending up immediately afterwards at the John F. Kennedy Center, which is west of the White House.
When Woodward comes to Bernstein's apartment after being told it may be bugged, he turns on the stereo - loud. This was unnecessary as they didn't talk to each other; they then communicated by typing.
At bottom left, when Bradlee calls out "Woodstein!"
When Bernstein is reviewing the Mexican checks in Dardis' office, Dardis says 'we have not been able ascertain who that is.' This is a reference to Kenneth Dahlberg who Dardis had rescued during World War II. Dardis should have remembered who he was.
At the beginning, a 'look-out' is communicating (via two-way radio) with the intruders in the Watergate. He is conspicuously highlighted by the room's light bulb in otherwise dark surroundings. There is no logical reason he would have the light on (potentially giving him away) other than so the viewer can see him clearly.