When the snake is first shown after Jenny stumbles upon it, it is in different position at the end of the shot, compared to the position it is in the following shot.
When Jenny is lying in the bed and Dr. Stephen tells her that it's all her imagination, her position is different than in the previous shot.
When Solange puts glasses on the platter and heads towards the dining table, they are differently arranged than when she brings them to the table.
Obvious use of studio lights that are trying to simulate how candlelight would light the room in every scene one is used.
When the butler starts filling the bathtub with water, it sounds like there's already water in it.
When Jenny ends up in a crypt, there is obvious light on the stairs and in the crypt itself when Dr. Stephen and Solange head towards her, but there's no obvious source of that light.