This article is from the Disney's Haunted Mansion FAQ, by Don Bertino bertino@netcom.com with numerous contributions by others.
Yes.
In 1986, a live person walked around the HM. He was in the area between
the coffin and Madam Leota's room. It was a great effect but one, it was
not cost effective and two, people were hitting and doing other things
to the CM and three, guest complaints. The CM had a remote to stop the
ride when this happened and it became such a problem it was discontinued.
 
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