Typically, only the "Main Course" items are considered entrees for the
DDP, anything in "Appetizers" (well, obviously

), "Soups/Salads", and "First Course" are usually considered appetizers (for the DxDDP).
When the main course section is broken up, it's usually pretty obvious as well (e.g. Tutto Italia's menu).
When in doubt, you can ask at the restaurant and they'll specifically state which sections are covered and which are not.