When Carol gets back home from work she takes off her shoes. A moment later, in the bathroom, she has them on her feet again.
No board can be seen nailed on the door (Carol nailed the board on the door in one of the previous scenes) when Carol crawls naked to the door, but in the scene where the landlord enters, it' back on the door.
The position between shots of the telephone and the envelope changes when Carol picks up the rabbit and goes to answer the phone.
Whenever a character takes the ringing phone off the hook, the bell sound is cut off abruptly as opposed to having it resonate.
Near the beginning of the film, when Carol has gone out to lunch from work and is walking on the street past the Saloon Bar, the shadow of the camera can be seen on her blouse.
Carol hallucinates a man breaking in her room and molesting her; the camera's shadow is cast on the bed in between shots.