One of the reasons for Hollywood History is the average scriptwriter or executive having a very cursory understanding of the era in which they're setting the story. Usually, they just want to take advantage of the basic 'theme' of that period, and figure that most viewers won't be able to tell the difference, anyway. See also Ye Goode Olde Days and Nostalgia Filter. Examples of Nostalgia Ain't Like It Used to Be include: