he said that the refs allow there to be more contact in the secondary. Second, he said that the Big 12 allows for more contact with blocking on kick and punt returns.

So basically he only brought up two differences and both were things that impacted his team's loss on Saturday.

https://www.youtube.com/watch?si=3mMnIAASILtSitXR&t=379&v=3NVCxmCD-I0&feature=youtu.be