As a small child I was absolutely convinced that people in the olden days lived their day to day lives in black and white, and that they walked slightly faster than we did today (assuming a frame rate thing?).
I'm gonna put this one down to my understanding of how TV worked as a ten year old. Everything before colour TV was black and white... therefore everything was black and white. Makes perfect sense.
What about you?
Oh shit... for me, it was "sepia tones" because I would see photos on the walls of my grandparents' houses and most of them were sepia toned.
"Actors on TV, weren't acting like somebody else when they were on a show. They were just themselves but reading lines from a script." Its weird that I remember understanding that the actors were not actually in a war zone or that a house on a TV show was just a set, but it took me a long time to figure out that an actor might behave like somebody else when playing a character. Doubly weird that I don't remember applying this consistently because I would never think that an actor playing a "bad guy" was actually a bad person but I absolutely would think that an actor playing a "good guy" would behave that way in their real life.