This doesn't make sense to me. If you place the Fireman scene from Part 1 there what sense does his statement "It's can't all be said aloud now." make? Clearly there it could be said aloud by then. Also why say "Remember" before the clues? He is going right out and using them, little need to remember.

From a narrative standpoint: "It is in our house now. It cannot be said aloud" sounds like right there and then, during this exact conversation, something is in the Fireman's house so it cannot be said aloud. Basically a surrealist interpretation of the old "we are being bugged right now so we have to speak in code". This works internally in the scene no matter where the scene is placed in the overall narrative. Unfortunately, Lynch & Frost decided to never expand on what is in the house, exactly which house they are referring to, and why it cannot be said aloud, so we will never know. I guess the simple answer is some evil entity like Judy is in the house at the moment of conversation, but honestly who knows - they just don't tell us!

For what it's worth, and this is complete 100% speculation on my part and completely my own imagination at work so you can skip over this part if you like, I think Dale is under the influence of the Black Lodge Spirits at this point, triggered when he saw Naido, aka Red Room Diane in disguise, and his head became superimposed over the image watching events unfold underneath without his control. The Fireman is speaking directly to the part of his conscious that is purely Dale, the superimposed head image if you like, aware that the Black Lodge Spirits have influence over the rest of him. Or rather Dale is having an out-of-body experience and the Fireman talks to the out of body part. Whatever is in the house can still hear them talking though. They can hear the words the Fireman says, but only Dale will be able to follow the code because it is made especially for him. But like I said, this is just my speculation arising from the fact the image overlayed when he saw Naido and Diane is totally dressed like the red room. It just says to me immediately, this Diane can't be trusted! Again though, Lynch & Frost decided not to elaborate on why Diane is dressed like that, nor why the image split when he saw Naido, so nobody will ever be able to provide an answer that isn't just speculation.

Why he says "remember", well on-screen it may seem like a short time to us the audience watching it, but we have no idea how much time actually passes between here and Dale actually finding Carrie, and we don't know if Dale can keep all his memories when he travels through the portal. He spends time at the convenience store, possibly jumps through time, even visits the red room again for who knows how long, not to mention however long it takes to get to the hotel, or even how long he sleeps for. Even Dale himself asks at the end "What year is it?" like he just suddenly twigged he doesn't know what time period he is in or how much time has passed.

From a structural point of view, again the rough edit at the fade-out with the shouts, then the rough fade-in at a different location, the observation about the pin, and just in the sense of an A to B to C narrative flow, "you finished mission A, now onto mission B", it would fit smoothly here. Also having something in the house at this point lends an urgency to Dale finding Carrie as the closing part of the narrative, but then during editing perhaps the pacing felt off so it was not felt needed to repeat it. Anyway, even if this scene didn't fit in here, something about the cuts are so rough on this sequence compared to the rest of the show it seems like it was definitely re-shaped during editing and something was cut out.

I have to come back to this thread so I'm bookmarking it for later!!  The giant conversation has been bothering me so I'm really interested in this take.