Direct Answer The transcript doesn’t describe specific early-church structures (like formal creeds or catechisms) that produced uniformity; it grounds that uniformity in the idea that early teachers were passing on what came from “the apostles and the apostolic age” across “all the churches worldwide.” A reasonable inference from the transcript is that shared apostolic tradition and a common way of reading Scripture (especially through Jesus’ teaching) functioned as the unifying “teaching structure.”
Support from Transcript: