The ring in the Blakeney portrait varies between long shot and closeups.
The jailer who tells Chauvelin about the Le Lion d'Or has his arms folded in one shot and then by his side in the next.
In the palace, one of the nobles is holding a newspaper in his left hand and his eye monocle in his right hand. However, in the next shot, it is switched and he is now holding the paper in his right hand and the monocle in his left as he gives the paper to the Prince.
When Marguerite at her residence is standing and talking to Citizen Chauvelin, her hand changes orientation between shots.
In the Ball scene when the Prince introduces the Countess de Tournay and her daughter; the daughter's handling of the fan changes orientation between shots.
At the beginning of the film when soldiers start marching into the courtyard, there are three Black soldiers lined up together playing percussion instruments. However, it is quite obvious that the middle soldier is a White actor with Black makeup.
Blakeney and the Prince of Wales are seen at a boxing match in which the combatants are in a structure similar to a modern 'square' ring. This form of the ring was not used until around 1838.
At Grenville's ball, the final movement of Wolfgang Amadeus Mozart's "Eine Kleine Nachtmusik" is performed. The piece was published in 1827.
In the Prince's quarters, Williams asks the Prince if he read the Times today and he answers no. He then informs the Prince of the guillotine executions transpiring in France. The other noble then brings the newspaper to the Prince and asks him if he read a certain article regarding the guillotine executions. The Prince then reads it as if he is learning about the executions for the first time. This makes no sense since the Prince already answered that he did not read the newspaper thus he didn't read the article. In addition, Williams already informed the Prince what was going so it shouldn't be a great surprise when he reads about the executions.
At the beginning of the film during the marching formality; the soldiers standing at attention are meant to remain still. However, there is one soldier on camera right who keeps turning his head.
Sir Percy Blakeney repeated pronounces "zounds" as though it rhymes with "bounds"; it was pronounced to rhyme with "wounds"