Is the castle called Cinderella's Royal Table?
Looking at the 2008 pdf brochure, it has a big G for "gratuities included" next to A Fairytale Lunch, Once Upon A Time Breakfast, and Dreams Come True Dinner at Cinderella's Royal Table.
Each is also 2 table service credits.
So while most table services don't include tip, those do, and I think some others do too.