Factual error: The year is 1952. In an exterior scene, Saoirse Ronan is seen on a street in Brooklyn. In the far background, a red "WALK/DON'T WALK" sign is flashing. This type of sign was only introduced across NY in the late 50s.
Factual error: The 'Post Office' is nothing like an English one would have been, even in a remote rural location in Victorian times. It seems to have been transposed from the American Wild West.
Factual error: There seem to be modern "Walk" and "Don't Walk" signs at each intersection. This film is supposed to take place in 1952. Also it is mentioned there are "Stereophonic" consoles in the motel rooms. Probably would not find those until at best the late 50s.
Continuity mistake: Near to the end Gabriel Oak leaves the farm and as he leaves his cottage he is dressed in a white shirt, cream trousers and a dark waistcoat. When Bathsheba Everdene catches up with him on the road he has completely changed his clothes and is now dressed predominantly in blue.
Factual error: Herman Melville interviews whaling survivor Thomas Nickerson in Feb. 1850. Nickerson tells him "I heard a man from Pennsylvania drilled a hole in the ground recently and found oil." Oil was discovered in Titusville PA in 1859.
Revealing mistake: Right at the beginning of the film "rain" is falling on the car the camera shows before it moves to focus into the tunnel. However, look at the cars behind it, they aren't wet at all and it's visibly sunny. It's water being poured onto the car directly in front of the camera.
Continuity mistake: The full table of scores for the contestants is visible before the Carl Hayden High School students actually did the task (they were the last group to do it). (01:25:20)
Continuity mistake: The getaway car changes from a Peugeot Partner (1996-2003) to a Citroen C3 Picasso (2013-2017). (01:35:30 - 01:36:05)
Revealing mistake: When the twins are born neither baby has an umbilical cord attached to them. Also the baby girl has a bellybutton.
Factual error: When he is in the restaurant and looking at the security feed, he does a who command when it should be "whois". Also the IP is incorrect - the 3rd octet is 265, despite the maximum possible value being 255.
Visible crew/equipment: When Bryson and Katz are getting onto the Greyhound bus, a guy in a fluorescent jacket can be seen holding traffic up in the distance whilst the scene is filmed.
Factual error: Near the end, Jackie Chan's vastly-outnumbered forces resort to throwing stones to somehow utterly destroy a phalanx of Roman legionnaires in close-quarter combat. This scene flies in the face of what we know about Roman military superiority in the time of Tiberius. The Roman Army was the best-trained, best-organized, best-equipped military force of the Ancient World, specializing in tireless close-quarter combat and impenetrable defense. To suggest that Jackie Chan's frantic and disorganized group of fighters (throwing stones by hand) might overcome Roman legionnaires is like suggesting that cave men might overcome the modern U.S. Marine Corps.
Other mistake: Ma and Jack bake a cake, but there is no way of doing this as they have no oven - only a work top hob and a grill.
Continuity mistake: Maggie leads Henry away from the manager and the wasted actress on the bench. She puts her hand on his right arm, which turns into the left at the cut. (00:28:45)
Revealing mistake: When Rachel has a red turban on and is supposed to be bald, you can see her hair under the turban.
Factual error: Ann plays an organ in a church with no electricity. And no, there was no manual bellows to make it work; the movie makers simply didn't know the difference between the operation of an organ versus that of a piano.
Other mistake: The town is Mt Barker. The red and blue ribbons on the sheep pen say Mt Baker.
Continuity mistake: When the young boy loads his bow and arrow while talking to his older brother, he does this twice without firing it. (00:53:55)
Character mistake: The protagonist is reading the review of his book "Bitter Tulips." The influential literary critic publication apparently has zero proofreading, since the article says that the novel "can be described as AN failed experiment." (00:45:00)
Continuity mistake: When Laha is talking with Clarence in the car, asking why she is in the country, whilst he says "Businesswoman, engineer", he is shown moving his left hand around, asking for a hint. In the next shot, his left hand is suddenly resting flat on the head rest. (01:07:20)