Smallville's target demographic was like....16 year-olds.
Well, older teens and college students, probably, but otherwise, that's exactly the point. There are many different demographics out there, so it's unwise to expect everyone in the audience to have the same knowledge and interests. One of the first rules of writing I learned was, never assume your audience knows what you know.
Way back in the '90s, I submitted a spec script to
Star Trek: Deep Space Nine and got an invitation to fly out to LA and pitch ideas to the show. While I was there, I stayed with my cousin who works in the film industry; he founded a company that's responsible for providing most of the bicycle, skateboard, skating, etc. equipment and stunts in Hollywood productions, or at least was at the time. At one point during my stay, I got to talking about how I'd gotten nowhere with my spec script to
The Next Generation and was hoping to get a chance to pitch to
Voyager, and it gradually came out that my cousin had no idea that the shows I was talking about were related to each other, or to
Star Trek. He was actually part of the film and TV industry, but was unfamiliar with one of the biggest and most successful franchises on TV at the time. (To be fair, there haven't exactly been a lot of bicycle or skateboard scenes in Trek.) I learned then that you can never make assumptions about other people's media knowledge. Even someone that you'd expect to have the knowledge might actually have a narrower focus than you realize.