It’s really strange how going to the bird’s room for the first time updates the story progression up to that point; usually you’d expect story update triggers to occur from one-time events. The part at 3:18 is interesting too, since it plays the cutscene that occurs when you run away from Doopliss after Vivian joins you.
I haven't watched any actual gameplay of this game, so now I wanna know, WHY DOES PAPER MARIO MAKE MARIO SOUNDS??? From what I know Paper Mario has NEVER made any sounds, game is unplayable 0/10