Was Windom Earl trapped in the black lodge while deployed to Twin Peaks for project bluebook? Was the Windom Earl we saw on Twin Peaks a doppleganger? I believe so - he escaped from a mental institution and went back to twin peaks because his 25 years were almost up. It's understandable that he forgot exactly where the entrance is after all that time. The main clue to this is when Leland/BOB is being interrogated by Cooper after his arrest. He is asked 'did you kill Teresa Banks?' He replied, as BOB - 'I guess i sorta did - I have this thing for knives' - Then he turns to Cooper and says  'Just like that time in Pittsberg'. How would BOB know about that - Unless he was possessing Windom when Windom stabbed Cooper in Pittsberg. It would certainly explain why Windom Earl became a homical maniac and killed his wife. Can anyone explain how BOB knew about Earl stabbing Cooper in Pittsberg?

Beware of BOB

When I call out no one can hear me,when I whisper he thinks the message is for him only..my little voice inside my throat,I always think there must be something that I've done or something I can do...But no one no one comes to help,he says,a little girl like you...

Yikes.  I think a more accurate way to say that is that TP is certainly a supernatural narrative, but that people wishing to deny such elements can, with some effort, piece together a "rational" narrative that is nowhere near as meaningful.

Maybe you can say that the Laura/Leland abuse can be explained as you suggest... but not much else.  How would you rationalize the visions various people have throughout the series?  How are so many people seeing visions of the same figment/manifestation of Laura's abuse (i.e., BOB)?

I agree that it's a little crazy to try and attribute everything to supernatural influence... but I also don't condone the opposite, which seems to be the suggestion above.

Let me put it this way. What we see is an abstraction - distorted. We shouldn't really be seeing those dream sequences - we are observing from outside the TP world. From someone like Dr. Hayward's perspective there is nothing supernatural occuring. I guess what matters most is how do things look like to the characters within the story. So, which characters believe they've experienced the supernatural?

1. Cooper
2. Briggs (unless this is considered to be extra-terrestrial in nature - not really supernatural)

...others... 

"I have this thing (Leland) for knives. Just like that thing that happened to you in Pittsburg that time, huh Cooper?" 

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