Is this a mystery (spoilers)?
Is this story supposed to be a crime mystery to be solved? Or is it just about some weird characters and their interactions?
There seems to be a relationship between Frank and the "Yellow Man," and there's a hint that Det. Williams knows about it. Is it about corruption, where the Yellow Man, who works for the police department, is involved with Frank, Ben, and his other thugs? Does the ending solve the mystery? Or are we supposed to experience the film just as a series of dream-like scenes? There is a hint at the end, when Jeffrey wakes up on his lawn chair, that the whole story up to this point has been a dream. Maybe we're not supposed to make a coherent story out of it.
But even Mulholland Drive, whole mostly a dream, is supposed to presuppose a real story about Diane Selwyn as a failed actress. Is there a real story in Blue Velvet?
"Extremism in the pursuit of moderation is no vice."