I think it’s fascinating how every Muppet movie has two entirely different “Fourth Walls” that are treated in completely opposite ways

Wall 4a is about questions like “are we in a movie? Are our experiences here following a pre-written plot? Do we know the audience exists? Can we bend or break the narrative rules governing how we proceed through this story?” This wall is a highly permeable membrane, a mere suggestion

And then Wall 4b is about questions like “what IS a Muppet anyway, why do they exist and how do they work” and that wall is IMPENETRABLE