cosmicpines:

The secrets in the Wheel of Secrets in Between the Pies.

Possibilities would have been (bolded are the answered ones):

Tapestry, Dipper’s name, Blood or Jam?, Mabel’s Secret, The Bear Bear, Gompers, Blendin’s Hair, Mr and Mrs Pines, McGucket’s Song, Monocle, Footbot Dream, Fingers, and Northwests.

…So basically Alex answered all the ones we weren’t dying to know about.

Alex Hirsch: How did the Between the Pines go?
Gravity Falls PR Guy: It went great, sir, but the fans are raving.
Alex: They always are. What is it today? Demanding to know Dipper’s name, wondering why I didn’t mention Ford?
PR Guy: Not really, sir, they’re just demanding you let McGucket sing.
Alex:…
Alex: I swear to Moses they do these things just to spite me