Advocate smaller and more frequent retrospectives, to ephasize the value of continuous improvemenent
In dysfunctional teams, a strong emphasis is placed on the daily stand-up, because it is a window through which management can micromanage. There is a tendency to plan to full capacity, with no slack, a tendency to apply pressure to the team to deliver, and hence a tendency for the team to fall behind. In many teams, to "save time", the retrospective is held infrequently or dropped, or has no useful outcome because problems are able to go unchecked and grow, becoming harder to get traction on solving.
If scrum were to advocate making retrospectives smaller, and more frequent, it can encourage actionable outcomes and a mindset of improvement. Perhaps the question "what can we do better today" or "what can we improve today" should even be added to the daily stand-up, to help teams to think about and act on these things.
Equally, feature level retrospectives should be a tool that is available to teams, where once a feature is delivered the team can feed back learnings (good and bad) without waiting for a sprint end. Why defer the opportunity to improve?