I have recently come across some pages that were marked as nothing to transcribe when there was clearly something to transcribe. They were typewritten pages that clearly were part of the historical narrative. My suggestion as a fellow volunteer is if you are not sure, skip the page. If you don't feel like tackling the page, skip it. Also, if you do not complete a page, do not submit it to be reviewed. Just leave it as pending. Overall, I am very impressed with the work people have been doing. Some pages are extremely difficult and time consuming but you are doing yeoman's work.
These are just my suggestions and observations and will leave it to the moderators to correct me if I am overstepping.