One fun thing to do when watching movies is to guess when the movie was made based on the haircuts. I caught a few seconds of some movie recently while passing through the family media room and I thought “couldn’t we date movies by cellphones?”. Cell phone styles and functions change so much that I think if you studied a bit you could make some fairly accurate guesses about the production date of a movie by looking at what the characters make phones calls with (e.g., grey scale vs. color display).
P.S. SWIPIAW has been watching classic Star Trek. I must say, I did not really notice when I watched those originally just how short the skirts were. You can see the actresses underwear most of the time when they’re walking away from the camera.