On a related note...
1. Are there indications on the menu if something is excluded from the dining plan?
I've never seen anything.
2. Do the waitstaff know when you are seated if you are on the dining plan?
At every TS restaurant the server will ask you if you're on the dining plan, then explain what you're entitled to. After a while you'll be have their explanation memorized.
Once you've looked over the menu you can ask if something you see is included or not, if the server hasn't mentioned it. Perhaps it's about the rules for "for 2" items or non-alcoholic beverages such as milkshakes, smoothies, virgin cocktails, specialty beverages, etc. which some Disney owned restaurants will let you order.
I would like to avoid a situation where we order something thinking we are on plan and then get the check and find out " Oh no sorry those two items weren't part of the plan".
See #2 about asking before you order.
Thank you,
Sharon