Others have mentioned local programming, and in particular the craze in the 50s and 60s for late-night horror hosts showing bad science fiction movies.
Everyone has their local favorites, but for sheer breadth of cultural influence, none can top Cleveland’s Ghoulardi. As I’ve said elsewhere, during his relatively brief run (1963-1966), he was singularly responsible for thousands upon thousands of northeastern Ohio kids growing up slightly skewed…in a very positive way.
The local programming angle also extends to after-school programs on weekdays. Each city had its own variety of hosts, and more than one in larger markets. Cleveland had Barnaby, Captain Penny and Franz the Toymaker, among others. The thing is, these guys had to come up with new material five days a week, 52 weeks a year…and through the 60s at least, it was performed live every day. An amazing workload I doubt entertainers of today would be up to, much less writing staffs.
And the other great thing about these shows is that it gave a whole new generation exposure to the classic cartoons and film shorts of the 1930s and 1940s. What a list of greats:
Laurel and Hardy
Our Gang
The Three Stooges
Popeye (the Fleischer shorts in particular)
Looney Tunes and Merrie Melodies (through 1948)
…and many more lesser lights. Hell, I’ll even give the Bowery Boys a shout-out here! It’s hard to imagine my childhood without this, and it’s only relatively recently that the complete works of some of these luminaries have finally become available on DVD and treated with the respect they deserved.
Failing a DVD purchase, you play hell finding most of these films on TV at all these days. So we have succeeding generations having little idea of who they are.
One other thing I miss: local TV stations bought syndicated packages of old theatrical films and would show them late at night. Once I got out of high school, I was an inveterate night owl, and would stay up till 4:00 in the morning at times watching them. Many were B-films at best, but they still were enjoyable. And you’d occasionally see some genuine classics, too.
Now, once again, we have TCM…and not much else. And even with 24-hour programming, there’s so much they don’t get to. So these films have descended into that same black hole.