It’s neat that the summary is referring to the search results using numbers and highlights the corresponding result when you hover that number. Depending on where you have the summary, the highlighted result get outside the screen quicker and therefore not visible, though. I’ve found myself counting the SERPS to find a result that was referred to by the summary. Perhaps this might be another good use case to number the SERPs
I also noticed that from time to time all references are also collected together at the end of the summary. This is not always the case, but this “summary of references” at the end of the summary have helped with this as well, though it wasn’t always completely effective.