As Lorcan said, this episode was jam-packed.
Some other notable moments:
Janey-E is Diane’s sister! I doubt Janey’s in on the Dougie ruse but I wonder if the Bad Dale manipulated her into falling for him. Thus, her falling in love with Dale is her first genuine response to her husband.
The English guy with the green glove had an awesome story to tell. The Fireman said quite a lot to him. Am I right in thinking that the guy’s accent is outdated, or at least super exaggerated for comedic effect?
The ringing noise in the Great Northern is emanating from that room James saw in the basement. I wonder if the noise isn’t related to Ghostwood lumber at all?
EDIT: I also think this episode gave an indirect confirmation that the Fireman pulled Laura Palmer from the Black Lodge in episode 2. Naido was also yanked quite forcefully from the roof of that limbo building in the episode she appeared in, and it seems likely that the Fireman put her in the woods for whatever role she’s going to play in the conclusion.