Camera pans across the tossed room with woman's dead body. When the police come up, the position of the woman's hand has changed.
The closeup of the map in the real estate agent's office bears no resemblance to the full map shown, as the camera pans back.
When the police enter the room with the dead body, they move an object before touching the body. The object had not been there previously.
After the cousin is forced out at the first visit, Bella and Paul are talking. Her hands are in her lap, but then her right hand jumps to her neck/face.
After the murder of the old lady in 1865, a police constable is shown blowing a whistle to summon assistance. Whistles were not used by the Metropolitan Police until the 1870s; prior to that they used a football rattle to attract attention.
The female music hall singer's lips don't move as she as singing.
After she is dead, Alice Barlow can be seen breathing (chest rising & falling).