How to exclude some fields from "Preview before Submission"

Is there a way to have certain fields hidden on the Preview before submission screen?  

Also, I marked to have empty fields hidden and it still shows a table that is conditional.  

You can achieve hiding some fields from the "Preview Before submit" widget by following the guide below: 

1. While on the wizard, on the Hidden Fields section , paste the Name of the field you want to hide : 

You can refer to this guide in order to know how to find the Name of the fields :

http://www.jotform.com/help/146-How-to-find-Field-IDs-Names

http://www.jotform.com/help/146-How-to-find-Field-IDs-Names

Kindly do let us know if you need further assistance.