Similarly, the depiction of the Jewish prisoner or rather, Sir Percy's depiction of the Jewish prisoner might be read with some discomfort by modern readers. Note that Percy is deliberately playing to the Frenchmen's prejudices.
There's also perhaps a touch of Reality Subtext here: at the time the Baroness wrote the novel France was still hashing out the Dreyfus Affair, which wouldn't be satisfactorily resolved until 1906.
The sequel novels
Foe Yay: Chauvelin and Sir Percy, the man who haunts "his daydreams and his sleepless nights."
Sir Percy Hits Back reveals that Chauvelin has an 18-year-old daughter. Count how many adaptations make him an ex-suitor or love interest for the 25-year-old Marguerite. Not a lot of hindsight is even required here, since almost the first thing the original novel says about him (even before the first "fox-like") is that he's "nearer forty than thirty".
In The Life and Exploits of the Scarlet Pimpernel, written by Baroness Orczy's son, Sir Andrew recalls the day Blakeney explained his reasoning behind adopting the scarlet pimpernel motif and his m.o. of leaving his calling card whenever he made a rescue:
Complete Monster: In 1937's The Return of the Scarlet Pimpernel, Maximilien Robespierre is the head of the Committee that rules France. Responsible for the Reign of Terror, Robespierre sentences countless people to the guillotine, enemies of the state and rivals alike. Plotting his own coup and a purge of any potential rivals, Robespierre also sends his agent Chauvelin to kidnap the Pimpernel, Percy Blakeney's wife Marguerite, while she is pregnant, deciding to have her sent to the guillotine regardless of her value as a hostage before providing twenty more names to be arrested and executed.