I just caught a few minutes of the old James Bond film, From Russia with Love. James and the obligatory sex interest were taking a ride in a powerboat, he at the helm and she standing next to him. In the long shot, I would say they were doing about 20 knots and the sea was choppy, but in the close up the boat wasn’t moving up and down and the actress’s hair was undisturbed. Then she wetted her finger and held it up to judge the wind direction!
Hilarious, but what I’m really curious to know is whether adult audiences in the 1960’s noticed that sort of thing.