Animaniac93-98
Well-Known Member
The hallway is a by product of the show building location... Not really a holdover from the early walk through concept.
Long Forgotten blog has shown that the hallway and placement of the showbuilding date back to before a ride concept was settled on. Remember that the house and grounds themselves were completed in 1963. It's why Disney was able to show the stretching room concept on a January 1965 TV episode, more than two years before Adventure Thru Inner Space would settle the argument for what kind of attraction HM would be. They knew for a long time the "house" would be just a prop and you'd take an elevator to get under the RR tracks into the real show area.
One blog post that explains this all better:
http://longforgottenhauntedmansion.blogspot.ca/2013/01/to-find-way-out.html