When Julie goes to Fergus's studio the second time to model, he gives her a special bracelet to wear (designed by Calder). But seconds before, when she is in the bathroom changing, she is clearly already wearing the bracelet.
When Coral shows his ticket at the theater, he is told that the performance had started three minutes ago, and is immediately shown to his box. When he gets inside the theater, the performers are in the middle of the second movement of the piece (Beethoven's Cello Sonata #3), implying that they had been playing for at least 10 minutes.
Before Julie gets to Robert Coral's apartment, there is a picture of a girl in a bikini just to the left of the door. But when she first enters the apartment, the picture is gone.
When the maid returns Coral's gin bottle to the closet, the bottle is almost full. Later in the day, when Coral comes to the room and gets the bottle to have a drink, the bottle is almost empty.
During the interrogation of Julie by the police, victims are shown on a screen from a slide projector. One of the portrait slides are shown inserted in upright position in the slide projector which would result in an inverted screen picture. But the screen picture is shown in correct upright position.