Goofs

The assertion that the application of leeches could cause "death, or disfigurement" is absurd.

The winning lottery number only has 4 digits (and the ticket only has space for 4 digits) implying that there could only ever be 10,000 different lottery numbers in that lottery. However, Sardonicus wins enough money to become a baron and buy a castle. The only way this could happen is if either each lottery ticket cost a great deal of money, or if the organizers of the lottery made a huge loss.

Sir Robert "invents" the hypodermic needle, despite its having been invented decades earlier than the film's 1880 setting.

The film doesn't say Sir Robert invented the hypodermic needle. It correctly says that Alexander Wood invented the modern hypodermic needle and syringe. However, it is true that this invention was made long before the date the film is set in.

In the opening scene Sir Robert and his assistant Wainright are working on a paralyzed girl's legs. The story is set in 1880 yet the young girl clearly shows evidence of a recently-removed band-aid from the side of her right ankle. Adhesive bandages were invented in 1920.

In 1880, the Baroness talks of a "fascinating writer" Sir Arthur Conan Doyle. Doyle did not publish his first minor work until 1883, and was not well-known until the publication of the first Sherlock Holmes story - "A Study in Scarlet" in 1887. However, she correctly refers to him as "Mr." Conan Doyle, who had published some short works beginning in 1879. Doyle wasn't knighted until the turn of the century.

There is a clear dub towards the end of William Castle's prologue. The script appears to have been changed.

As the Doctor arrives in the train depot in Gorslava, the door opens and the camera pulling away is reflected in the door's glass.

All of the mirrors have been removed in the castle yet all of the female's hair and make up are impeccable as are the men's clean shaven faces.

Sir Robert attempts to shave when he is already clean-shaven to begin with.

A doctor would know better than to yank feeding leeches off of a person's skin. Attached leeches need to be removed carefully or there is a risk of infection (which 'pre-antibiotics' could be much more dangerous than the leeches themselves).