I think context for research could also include why you want to do the project. Eg. why you are motivated, why it is important etc. I only say this because I've submitted a proposal and gotten feedback that I didn't properly explain the why of it -_-

It's not a complete disaster. If you have details of your informants, then you could check quotes with them first before proceeding. Also, not all researchers use audio all the time, there could be reasons why it's not ideal.

Not at all crucial :)