Miss Harrison's assistant seems to be able to fly. She appears at Ferndell to help take Enola's measurements, although Miss Harrison arrived alone in her automobile. She later appears at the "finishing school".
When Enola finds Tewkesbury at the flower stall he gives her a pinkish open rose. In the next scene they walk away and the rose is much more closed.
In the warehouse scene where Enola is being pushed head-first into the bathtub full of water, it is clear from the external shot that she is in the short edge of the bath and her hands are both placed widely apart and just above her head. Every shot under the water is taken from the long-edge of the bath with her hands just below her chin next to her shoulders. These placements switch repeatedly as the shot cuts above and below the water.
The movie is set in 1884, however in the credits a button for an opera at St. James Theatre dated 1885 is pictured. It is logical to assume this might be from later in Enola's life, but otherwise would not fit the time line in which the movie was set.
The young marquess cannot take his seat in the House of Lords until age 21.
The film is set in 1884 and Enola meets Viscount Tewksbury on a train with an internal corridor connecting the compartments and connecting carriage to carriage. These railway coaches were not introduced to trains in Britain until the start of the 20th century to allow passengers to enter the newly installed dining cars.
In the encrypted cipher message Enola sends to her mother in the Pall Mall Gazette, the 9th column should actually read NYIM, not NMIY.
In the end fight Linthorn was discharging plastic shotgun cartridges, they were not used until the 1960's, before then paper cartridges were used.
Viscount Tewksbury represents a mushroom he picks from grassland as Agaricus Lanipes, aka the Princess Mushroom, but it is instead a Chanterelle mushroom, which does not grow in grassland.
In the final scene looking down on a London street scene, a number of horse-drawn vehicles are passing by. However they are travelling as they should be in London, when travelling on a one-way street.
(at 1 hour and 17 minutes) After Enola Holmes has been caught in the B&B, the scene goes onto a London street and two carriages are seen correctly passing each other, because they are travelling down a one-way street.
Early in the movie, the Pall Mall Gazette #6220 is seen (with the DISTURBANCE ON LONDON EXPRESS article on the left page, at the 37:40 mark), while later in the movie, the Pall Mall Gazette #6207 can be seen (with the headline DEADLOCK IN LORDS AS VOTE LOOMS, at the 1:28:11 mark). The number of the latter should obviously be bigger than the former's.
The character of Enola Holmes fails to match historical accuracy and period authenticity since she has removed her underarm hair.
The carriages in the closing scenes are on the right side of the road. The norm in the UK has always been to drive on the left. Became law in 1835.
When Enola and the viscount return to his home, he asks, "Where are all the servants?" as they enter an empty hallway. Enola replies, "Welcome to the future", indicating she thinks servants will soon be a thing of the past. Such thinking, however, was not in the least common in the 1880's, even with the reform bill and progressive changes. Moreover, there's no way an estate as huge as the viscount's could even consider running without a large staff.
Towards the end of the film, a bus passes with various destinations written on its side. One is Edgware Road, incorrectly spelled Edgeware Road.
When Enola and the Marquess are in her lodgings, she says "What did you do, rent a room at the Ritz?" Cesar Ritz didn't open his London hotel until 1906.
When Linthorn is emptying spent shotgun casings in the hall, the casings are made of plastic with brass primers. In the late 19th century, the casings would have been made of exclusively brass or paper.
The martial arts handbook's title uses the term "jujutsu" but that is from the Hepburn Romanisation of Japanese which was not published until 1886 (2 years after the film is set) and did not become common until much later. In 19th century English "jiujitsu" was the preferred spelling. Later in the film, Enola pronounces it "jujitsu" in contrast with the title of the manual she studied.
Miss Harrison's car did not go on sale until the year after the film is set. It would have been impossible for her to already have one in 1884.
In the long shot of the steam train passing a field, the two horses running around in it are wearing modern fly rugs.
Limehouse Lane is pictured directly south of the river to St Paul's. It is more likely to have been in Limehouse East London and not in sight of St Paul's.
It is not surprising that Enola's embroidery at the finishing school is wretched, since she had not done any previously, but someone as well-read as she, taught by an educated mother, would not have misspelled the word "patience".
Every British marquess also has at least one lower title (earl, viscount or baron), which his eldest son uses during dad's lifetime; for example, the heir apparent to the Marquess of Salisbury is known as Viscount Cranborne. He would very rarely have occasion to mention any of his titles other than the highest.
If a lord has succeeded to the senior title only recently, he might plausibly announce himself as "Viscount Tewkesbury, or rather the Marquess of Basilwether," as he is not yet accustomed to the new title. But here he makes no such hesitation.
Because of how he presented himself to Enola, it is natural for her to think of him as Tewkesbury; but no one else who utters that name has any good reason to do so.
If a lord has succeeded to the senior title only recently, he might plausibly announce himself as "Viscount Tewkesbury, or rather the Marquess of Basilwether," as he is not yet accustomed to the new title. But here he makes no such hesitation.
Because of how he presented himself to Enola, it is natural for her to think of him as Tewkesbury; but no one else who utters that name has any good reason to do so.
As a woman in this era, Enola should curtsy, not bow.