Craig said :
first, sprint review is NOT demo, it’s all about conversation. Demo should be finished in minutes. Then PO and teams talk about the products, good and bad, and so on.
second, talk more about positive things, some teams only think negatively, that’s not good.
Third, conversation between product owner and teams, "PO, what’s your problem?", "team, what’s your problem?", to understand each other.
Continue next time, sprint planning still left.