At the table, with Penderel, Saul Femm is holding the curved-bladed knife, the curved edge changes from top to bottom between takes.
One of Gloria Stuart's elaborate earrings is missing about mid-film, it reappears for 2 close up shots and disappears again in medium and long shots.
Towards the end of the movie when Saul and Penderel are talking at the table, Saul uses his fingers to make the number two his palm is towards Penderel. Next shot the back of Saul's hand is towards Penderel.
Roger and Gladys go to a barn to get liquor from the car stored there during the driving rainstorm. When they are coming back to the house, there is a large puddle of water in front of the house but no rain is falling. Roger, carrying Gladys gets almost to the door when the water is turned back on. Rain pours near the door but not on the rest of the area in front of the house.
When Penderel talks to Gladys in the car, his head is propped up on his left hand. This suddenly changes to his left arm resting on the back of the seat between shots.
On the back cover of the Kino DVD release, the roles played by Gloria Stuart and Lilian Bond are reversed.
At about the 33 minute mark of the film there are two times when you can clearly hear the motor of the fan rev up to create the wind.