One option available today is writing on tablets. There are apps available that let you record and sync any notes you take to the recording. This lets you highlight a key point and then go back to the right spot in the recording. There have been various attempts to do this with special pens and paper but the tablet approach works pretty well.

It's not super-useful for me personally--I tend to default to a laptop for various reasons--but there have been times when I think note-taking like this would have been very useful.