While Rick and Genevieve make out on the bed, Rick turns to answer his beeper. In close-up, his hand can't be seen, but when it cuts to a long shot, his hand is near his face.
As Jason determines he needs a new oscillator, he's holding a sandwich with his left hand. It cuts to a long shot in which he's holding it in his right.
As Mrs. Karadyne begins talking on the telephone, she's holding a pad of paper in her lap. It cuts to a close-up in which she's holding the pad up closer to her breast.
As the bellboy leads Lisa to the elevator, she's behind him on the right. Cut to another angle and she's behind him on the left.
The movement of the spotlight on the right side of the split-screen is frequently out of sync with the light's movement on the left side of the screen.
As Delores Hamilton looks around the hotel lobby, her head moves slightly on the right side of the split-screen but doesn't on the left.
As Jason fixes the light above the painting, his shadow is not cast across the close-up of the painting on the right side of the split-screen.
On the left side of the split-screen, Jason picks up the photo of Mrs. Karadyne with his right hand. On the right side, he picks it up with his left.
As Jason exits Mrs. Karadyne's room the first time, the inside of the door on the left side of the split-screen closes tightly a moment before the outside of the door seen on the right screen.
On the right side of the split-screen, Lisa enters her hotel room clockwise, turning to close the door behind. On the left screen, she enters counterclockwise, facing camera.