Answering the last question first, yes, it is included on
DDP, and for the same number of credits the restaurant normally takes (see more below).
Basically, for three TS restaurants at DHS, you can book a "Fantasmic" dinner package that grants you access to reserved seating for that nights' Fantasmic! show. This meal time is generally in the late-mid afternoon, when the restaurant would normally be slower.
The restaurants are: Hollywood and Vine (standard buffet), Mama Melrose, and Hollywood Brown Derby. The latter two offer a special priced-fixed menu for Fantasmic that does include an appetizer, even on the basic DDP. H&V and MM are 1 TS, HBD is 2 TS.