The comments are specific to the image, not the record. Currently there aren't notifications to alert the collection owner about comments or transcription errors although that is something we have on our roadmap. The ability to have a dialogue with users as they interact with contributed content is an important feature.
We also plan to display stats to the publisher on how their content is being "consumed" on the live site. It could include granular detail, like how many records have been attached to trees, as well as aggregate data like page views and visitors.
Thanks again for your questions and suggestions,