Haunted Mansion is a classic Disney attraction since 1969. The Haunted Mansion was first planned to be a walk through style and one of the earlier concepts was it to be "The Museum of the Weird." Then after the 1964 Worlds Fair Disney and WED rethought the idea of the attraction to be a "ride".The ride system that they were planning and used was called the omni-mover then later renamed to "Doom Buggy." After Walt's death the attraction progress slowed down extremely and that is when a lot of the urban legends began to start. Ever since the opening day of the ride the ride itself didn't really change much beside for minor fixes and changed to the storyline. Also a major change to the ride in 2001 was the holiday overlay of Haunted Mansion Holiday.
I love the Haunted Mansion ride but for the movie not so much.