The document discusses common mistakes presenters make with visual aids, notes, and collateral material. It states that visual aids should only be used to emphasize points that cannot be explained through words alone. Presenters should not rely on their slides as notes, but rather use separate notes to stay on track. Slides should be removed after the point is made so the audience focuses on the presenter, not the visual. The document provides tips on how to effectively use visual aids, notes, and collateral material for presentations.