The Red vs. Eric Dynamic is essentially the generational contrast between parents and kids. This trope has been used before and is a recipe for comedic gold. The stuffy conservative dad, Red, wants his kid to get his lazy ass off the couch and mow the lawn. The slacker liberal kid, Eric, wants to smoke pot, hang with his friends and borrow the car. Hijinx ensue.
The whole premise of the original series hinged on this battle between the old way of doing things and the new one. The past and the present. Them versus us (or us versus them depending on how old you were when you watched and whether you considered yourself more of a Kitty or a Jackie). And this was fun. It was relatable and ripe for genuinely funny situations, from the time Eric gets “the talk” from his parents to the time Red and Kitty accidentally eat pot brownies. But it also underscored a way for teenagers then (in the ‘90s) to relate to teenagers from way-back-then (in the ‘70s). Our parents were once like us, the show implied. And all of us are doomed to one day turn into squares.
The second winning element was clearly the Kelso Effect. As in, the casting directors struck gold with their young cast: Ashton Kutcher (Kelso), Mila Kunis (Jackie), Topher Grace (Eric), Laura Prepon (Donna) and Wilmer Valderrama (Fez). (I’ll leave scandal-plagued Danny Masterson off the list of actors I’m glamorizing here for a number of upsetting reasons you can Google yourself, but his Hyde probably would have been skipped anyway. He’s the notable cast member who didn’t go on to a big future career.)