Factual error: Sir Malcolm tells Vanessa to wear a facemask when they go to minister to the poor as cholera is rife in the area. However, the series is set in the 1890s and it had been well-known since the 1850s that cholera was caused by contaminated food and water and not by airborne germs. As an educated man, Sir Malcolm is bound to know this.
Factual error: Sir Malcolm and Evelyn fire the Mauser C96 Broomhandle pistol. The series is set in 1891 or 1892 and this weapon was not introduced until 1897.