When Gail is driving Topper's car in the chase, there is a close-up of the steering wheel moving on its own, and there is no assist knob present on the steering wheel. But, at the end of the chase when she gets out of the car, the knob is clearly visible.
After falling into the water numerous times, Eddie should be soaked to the skin. Yet, even with his full length fur coat and chauffeurs uniform, he's often dry a few scenes later.
Gail Richards' ghost retrieves the burning note from the fire place and blows out the flames. However, later when she shows the note to Cosmo, the note is undamaged.
When Bob the cab driver goes after Ann's attacker on the balcony, his hair is messed up by the wind, but when he comes back in and confronts Lillian the housekeeper, his hair is neatly combed.
When Ann first meets her father, talks to the clock-winding woman and receives the jewels, she changes chairs from one with a straight top, to one with a curved top, and back again, as well as going from sitting properly to sitting on the arm.
When Topper goes by his house with the girls in the car it is broad daylight. When they arrive next door at the Carrington mansion it is full dark outside. Topper and his chauffeur drive away without even seeing if anyone is home to let the girls in.
When Cosmo, Gail and Eddie are walking towards the house in the snow, Eddie stops walking putting Gail to Cosmo's left (she grabs his arm). In the next shot a tree branch on Cosmo's right moves as if Gail moves it, but Cosmo still has his left arm raised as if Gail was holding his arm.
When Gail is driving Topper's car in the chase, the head of the actual driver is visible in the shot where the car skids around a hairpin curve.
Many wires can be seen as the "ghost Gail" is changing her outfit in the Chinese room.
When Gail the Ghost is driving the car, there is a close up of the steering wheel and pedals. However despite the fact that the car is traveling at a high speed, rounding curves and blowing the horn; you can see the steering wheel moving but all the car pedals are perfectly still and there is no sign of a horn being pressed down.
In several scenes, when Gail is invisible and she lifts up one of the wine bottles, the wires lifting them up can be seen.
When Gail is murdered she let out a scream but no seems to hear, not even Ann, who was in the next room.
When an interrogated suspect is about to reveal something crucial, the lights go out, leaving the room in complete darkness. This shouldn't be since there's a fire burning in a large fireplace nearby.
When Mrs. Topper calls the police to report her "missing husband" she uses the same phone that Mr. Topper tried to use earlier. The phone is supposed to be out of order, yet the call goes through and the police arrive to investigate.
Early in the film, Eddie is looking for Topper and winds up plunging down a shaft leading to an ocean inlet. Later on in the film, Eddie is sitting in the trap door chair located in a different part of the house and winds up plunging down the same shaft as earlier.