Continuity mistake: The flower decal on Barbara's dress changes colour in some scenes.
Continuity mistake: Barbara's earrings change shape and color through the rest of the movie.
Continuity mistake: During the fundraiser, glasses of relevant guests (the woman in the red dress when she is introduced to Bruce, the stock broker when he is dragged away) disappear conveniently off-camera. It's quite a stretch to assume they found a waiter or a place to place the glass when they were not in frame (especially in the group of three women in front of the doors).