Goofs

When Rose is put into a cell at the police station she is handcuffed. Later she is given water to drink and the handcuffs have gone.

The sound of the judge banging a gavel is heard several times in the courtroom scenes. In England only auctioneers use gavels; judges have never done so.

The Constable Sergeant states that Rose can be charged with libel for the letters. This is flatly wrong - the letters are sent to Edith herself, not to any third party or the public at large, so the core element of a libel charge (publication of the allegedly false comments) and as such the Crown wouldn't even be able to establish a sufficient basis to charge a crime.

There is reference to the WPC booking a motorcyclist for not wearing a helmet. This was not an offence in the 1920s with compulsory helmets not brought in until the early 1970s. However this was explained as a local law in the film.

There are references to Rose's daughter been taken off her by the CPS; a modern organisation that begun in the 1980s.

The police uniforms have cap badges and buttons with the "St Edwards Crown" on it, used from 1953-2023, rather than the "Tudor Crown" in use from 1902-1952, which would be correct for 1920s England.

The UKs first female Asian police officer did not serve until the 1970s.

Edith buys an orange 2d stamp which she attaches to a letter she then posts. Earlier in the film there are close-up shots of letters with single 1d red stamps attached. The one-penny rate for letters ended in 1918.

The Judge presiding over the case is black. The first black Judge in England and Wales was not appointed until 1962.

Given the repeated references to the distinctive nature in the letters, and given the fact that Edith was made to repeatedly copy bible passages by her father, it's difficult to believe that both of her parents would not have recognized her handwriting. Edith also states that she assisted her father with sign making as a profession so he would have been very familiar with her handwriting.

After Edith collapses at the trial the judge says "We'll convene there" when he means "We'll adjourn there".