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?).
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.