Early on when Mrs. Whitman first arrives and is talking to Miss Wells in the bar they are approached by Mrs. Bentley. During their "discussion" Miss Wells's cigarette sometimes gets longer and the position of her arm jumps from shot to shot.
When Charlie is examining the police photos of Mrs. Bentley's body, they show her beauty mask tied around her head. But the mask was untied by the desk clerk to identify the victim, before the police are ever called.
When Curtis Whitman first approaches Charlie regarding the murder, Curtis hands Charlie a newspaper with a story of the crime. In the longer shot, when Charlie unfolds the paper the center fold is going up, but in the close shot of the paper, the fold is going down.