The other mistake I think people make is talking to who's available rather than talking to who they need to talk to.

People who are using your product and putting up with all these issues, means that they are not actually the biggest problems.

Who would you talk to? That is the first question for almost any startup that you need to answer. Who is my user and where am I going to find them?

Recording interviews is like magic. a) It stops you from taking notes in the middle and b) you can play that recording for people.

Users think they know what they want, but you get the horseless carriage effect where you're getting asked for a faster horse.

That's actually one of the most disappointing things about doing user interviews and user feedback, which is why I think... people don't do it. You're going to get negative news about your favorite pet feature most of the time.

The other mistake I think people make is talking to who's available rather than talking to who they need to talk to.