As I mention above Eugene Schufftan is credited with spfx.  According to Tim Lucas Bava was responsible for the colorful lighting effects and may have shot second unit material.  He says that in Italian parlance second unit means shots that involve only Italian personnel but could include talent up to the level of the principal Italian actors.  He also mentions that for some shots Bava utilized the ripple glass (no, not that kind of Ripple), given to him by his father.