I haven't been on the Inspiration recently.
As Cruise Fanatic noted, tips for Room Service are not included in Pre-Paid arrangements. They are also not included in Automatically Charged ship board accounts for other gratuities. I always tip for Room Service.
If, you are referring to the Formal Dining Room about the dress attire, I have not seen that in the Formal Dining Rooms. Here
is a link to Carnival's dress code.