You’re missing the point. Back then audiences weren’t told when to laugh (that became a thing a bit later). But were more like a live barometer of the script’s quality. The recordings of Jerry doing a standup on a bar stage were filmed the same day. They would test material, improvise jokes, actions and lines on the spot and look at the audience reaction, not because they expected a laugh, but because they were getting a laugh. This allowed them to fine tune the show, then during edit make it as hilarious as possible. It was a thing they actually struggled with the sections filmed out of studio, but they showed them to the audience so they got the context for the set comedies. It was a whole art, and the actors were part of the writer’s room. An entirely different vibe from this decade’s sitcoms.