 Due to the locality of Hollywood, the pink boxes frequently appeared as film and television props and were thus transmitted into popular culture.Yeast doughnuts and cake doughnuts contain most of the same ingredients, however, their structural differences arise from the type of flour and leavening agent used.In cake doughnuts, cake flour is used, and the resulting doughnut is denser because cake flour has a relatively low gluten content of about 7 to 8 percent.