I Downloaded a Ghost

When the family is at the dinner table, Stella's younger sister reaches for the mustard. She can't reach it and knocks it over, and goes back to her dinner. Throughout the scene, when the ghost is playing in the centerpiece, the mustard bottle can be seen sitting in it's former spot. As well, during one close-up of Stella during this scene, her sister can be seen using the mustard bottle. When the action goes back to the ghost in the center of the table, the bottle can again be seen sitting beside him (in its original spot)

References A Streetcar Named Desire (1951)