Oh, I believe you. I remember the '70s too!
Speaking of hairstyles -Charles Ingalls’ (Michael Landon’s) curly locks and other men’s longish feathered hair on the show Little House on The Prairie is out of place for the time period it was set.
Also the show depicts people using both telephones and phonographs. Granted both were invented BEFORE the show was set but it is unlikely that a town in rural Minnesota would access to either.
Little House is notorious for its inaccuracies and Tv Tropes has a page for its anachronisms.
https://tvtropes.org/pmwiki/pmwiki.php/AnachronismStew/LittleHouseOnThePrairie
They didn’t have flat tops in Ancient Rome!
I once saw a Western of some kind of TV where one of the main female characters wore large hoop earrings.
When “The Jetsons” was made, age differences like this were common, and not balked at if the parents approved, which in a surprising number of cases, they did.
Hair product sales were the only thing keeping Oleson’s shop in the black.