Sometimes in creating moving imagery we forget details. This is understandable when budgets are slim but when it happens in a motion picture series on TV with big budgets perfection is expected and we really shouldn’t see such goofs. For example, in the “Cheers” TV series Episode 15 Season 2 there is a scene where Sam Mallone is about to turn off the lights to Diane’s apartment but the light switches are already off.
He goes to shut the lights off. The actor must have noticed something is off. Literally.
It’s the switches they are already off. He pretends to shut them off. The lights dim.
Don’t do this at home when making iMovies. Remember to go over detalis.