How do you make the most of customer research sessions?

At the end of each customer research session, I always ask if I can take a screenshot of the call - just for internal use in my notes. It's a strange question to ask. But, especially when doing a number of calls, there's a risk of them blending together. I have my notes, of course. But having a picture of what the call looks like makes it easier to load that conversation back up in my brain. Taking a picture also creates a little celebration moment at the end of the call. Most people will smile for the screenshot and we get to celebrate closing out our research session together. What tips for customer research sessions do you have?