After everyone goes to bed, Poelzig enters Werdegast's room to "settle" things. But Alison and Werdegast have switched rooms. Werdegast enters the room to reveal this fact and is wearing only pajamas. Werdegast and Poelzig then exit the room. When the scene cuts to Werdegast's room, he is now wearing a robe.
When Werdegast and Poelzig are fighting near the end of the film, Poelzig is on top of Werdegast, choking him. Werdegast then turns the tables and ends up on top of Poelzig. After Thamal (Werdegast's servant) enters the room, Poelzig is suddenly on top of Werdegast, and is choking him again.
The adjoining door connecting Joan's room to Peter's changes from a sliding door (in scenes in the first half of the film) to a hinge-opening door (beginning when the black cat enters Joan's room followed by Karen and thereafter).