What problems did you encounter?
When i was editing I found that the audio quality was subpar even when using the lapel on the SONY MC50. We also forgot to record an ambient track.

What did you try to do to get past or mitigate these?
To get past this i fine tuned the audio track using compressors and noise reductors. I also placed music into the sequence to slightly mask the chatter in the background.

What did you discover about camera technique (e.g. composition, framing?)
Its important to position the interviewee to the right of the frame, and the interviewer behind the camera to the left (or versa). This means the interviewee is less likely to stare into the lens, and also gives the composition a visual gap where they can talk through.