Hi there, Ashton!
The
Disney Dining Plan does have a couple of restrictions.
Alcohol is not included in the Disney Dining Plan at any level.
If you are not on the Deluxe Dining Plan, some of the fixed-price three-course meals might not be available to you, since one of those courses is an appetizer, available only on the Deluxe Plan.
Generally, substitutions are not permitted.
An adult may not order off the children's menu, nor can a child order from the "regular" menu. Each entitlement is specific to the age of the Guest (0-2, 3-9, 10+).
When you are seated, let your server know that you're on a Plan, and s/he will be able to give you the up-front restrictions, if any.
Have a wonderful time!
See you later, celebrator,
-Deborah B.