Major new discovery in November 2012. See the end of the post.
We've been making use of the detailed floor plan for his "Ghost House" that Ken Anderson drew up on September 2, 1957. The plan was published in The "E" Ticket 41 (Fall 2004), pp 20-21. A lower resolution, smaller copy has long been available for download at Doombuggies.com:
Possibly this is something already noticed by the Disney archivists, but if you examine the plan carefully, you can detect markings all through it that appear to be Anderson's own indications of crowd movements, and sometimes the tour guide's movements. They amount to a mute commentary on how the attraction would "flow" from the man who created it. You can't see these markings on the DB.com copy, but after you twiddle a few knobs they become visible on the "E"-Ticket copy. If these Shroud-of-Turin-like markings have in fact not been noticed before, then I expect this will be regarded as a significant find in the eyes of Disney historians, Imagineers, and plain old Mansionoholics.
Throughout the plans, it appears that blobs are either natural assembly points—places where knots of people spontaneously form—or else areas of movement by the guide(s). Here at the beginning, a solid, organized group assembles outside the front door, on the step, and then enters in two lines. The butler tour guide apparently enters on the left and hooks around to stand on the steps and address the group. The set up is similar but not identical to what is seen in these sketches.
We know that the group descends to basement level, so it's difficult to know what Anderson had in mind with some of the markings, whether the marks indicate activity on the upper or lower level. Before entering the "Portrait Gallery" hallway, at any rate, guests form three lines.
The group crosses the back of the Library. There is activity at the other end, by the fireplace. Sketches indicate that this is a point where the guide gives a major backstory presentation. There are "Hairy the Arm" antics, and the Lonesome Ghost is introduced.