Any additional employment, salary, lecturing and/or any consulting must be related to your current work and is restricted. Employment or participation outside of your position noted on your DS-2019 requires written permission from OISSS.
As a J-1 scholar your options for incidental employment are limited. Please remember that employment without proper authorization is a serious violation of your status. Before you begin any kind of employment, you must first consult your RO or ARO, whose written approval is necessary in advance of your engaging in the incidental employment activity.