Another nice add-on to this format within my department is that we utilize an internal retro tool for people to post their questions for discussion.

After the 20ish or minutes of silent reading, we give people ~5min to post their questions for all others to see in real-time. We then give people a set number of votes and the presenter goes through the list answering the questions in descending order of votes.

I was hesitant at first when they introduced this (since it felt like more red tape), but I've found it helps focus the discussion on the most important feedback while avoiding one person bikeshedding the discussion time right at the beginning.